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Redline


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  • Offers a full line of trailer products for enclosed, utility and boat trailers
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Expert Answers about Redline

  • Trailer Suspension Hanger Kit with the Most Lift for Tire Clearance Under the Trailer Bed
  • The # APT4 Tandem-Axle Hanger Kit will provide about 4 inches of clearance from the center of the trailer axle to the bottom of the trailer frame, with no load on the axle. This is assuming that your axle tube is 3 inches diameter. If your axle tube is smaller the height will be sightly less. The curve of the springs you select will have some affect also. I would recommend that you go with the APT5 hanger kit because all of the hangers are the same height and it will make it easier to...
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  • Constructing an Axle from Pipe and Spindle for Use on Homemade Trailer
  • The Redline Spindle # R104BT8 that you referenced has a 1-1/4-inch diameter stub that is 4-inches long. This spindle will fit an axle beam (pipe) with a 1-1/4-inch inner diameter. While you can certainly fabricate your own axle to go on your homemade trailer, assuming you have access to a qualified welder, I suggest you consider buying a complete axle assembly from etrailer. Apart from the savings in time and labor you also benefit from knowing the exact capacity of that system, something...
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  • Choosing/Sizing the Correct Trailer Ramp Spring for a Ramp Door
  • When selecting ramp springs for a trailer ramp, you will want to know the diameter of your hinge pin and how much space you have available in the hinge. A typical horse trailer or utility trailer ramp uses 3/4 inch hinge pins and would require two ramp springs with a 3/4 inch inner diameter. The ramp springs that we carry fit 1-1/2 inch diameter hinge pins and are designed for use with heavy-duty steel ramps like those on equipment trailers or car haulers. The spring slips over the...
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  • Removing and Replacing Trailer Spindles
  • To replace a spindle, the old one would need to be cut off, and the new one welded into place. This is NOT a job for the do-it-yourselfer. The new spindle must be absolutely square with the axle in order to prevent premature tire wear and wheel tracking problems. I would recommend finding a welder who is experienced with trailer axles. Your local RV dealer or repair facility could probably refer you. In many cases, it's less expensive to simply replace the trailer axle itself. We offer...
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  • How to Determine Hub and Spindle Size
  • The spindle dimensions are as follows: A is the mounting dimension, B is the seal dimension, C is the inner bearing surface, D is the outer bearing surface and E is the diameter of the threaded portion of the spindle for spindle nut selection. Say you need a spindle and hub for a wheel with 5 on 4-1/2 inch bolt pattern and an axle that is 3500 lbs. For a single axle trailer you can use two of either the item # R20484, if your axle is round or item # SP20484 if your axle is square....
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  • Parts Needed to Add Electric Brakes to a Utility Trailer with a 3500 Lbs Axle and Brake Flanges
  • You will need several items to add electric brakes to your Carry-On Utility trailer. Starting with the trailer you will need a hub and drum that matches the bearings and seal on your trailer spindle and your wheel bolt pattern. The only way to be sure is to check the bearing part numbers and seal part number, but with a 3,500 lbs Dexter axle that has brake mounting flanges you will most likely have the # L44649 Outer and # L68149 inner bearings and # 58846 seal. If these are the correct...
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  • What is the Torque Requirement for 1/2 Inch U-Bolts for Trailer Suspension
  • According to our FAQ on slipper springs, linked for referenced, the torque specs are as follows: Torque Ratings 1/2 inch Bolts: 45 ft/lbs - 70 ft/lbs 9/16 inch Bolts: 65 ft/lbs - 95 ft/lbs 5/8 inch Bolts: 100 ft/lbs - 120 ft/lbs The Replacement U-Bolt, # 1753223, uses a 1/2 inch nut so it would fall into the 45 to 70 foot pound category.
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  • Can Trailer Axles Be Mounted Above and Below the Leaf Springs on a Trailer
  • The best and safest way to have the axles orientated to the leaf spring is the way the trailer was originally manufactured. The trailer manufacturer will have tested the trailer with the original suspension setup for adequate braking and handling performance. If you flip the axles it could work fine, but since it has never been tested it is hard to say for certain. With that being said, you can have the axles on the top or the bottom of leaf springs. If you do have the axles on top of...
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  • How to Measure to Select the Correct Brake Shoes for a 6,000 lb Dexter Trailer Axle
  • You will need to measure to select the correct brake assemblies for your axles. You need to know that the brake assembly is compatible with the brake mounting flange and with the drum's diameter and depth. I added a photo showing how to measure a hub/drum for you, Typically 6,000 lb Dexter axles have a 5 bolt brake flange, like part # 4-44-1, and utilize 12 x 2 inch brake assemblies, like part # 23-106. The correct brake shoes for these assemblies are part # BP04-150. If you measure...
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  • Side Wall Vent Recommendation for an Enclosed Trailer for Maximum Air Flow
  • Since heat rises I would at the very least put a set of the Trailer Vents # HMAV2-AVT2 near the top of the trailer to get the hottest air of the trailer out. What you could do for maximum air flow in your trailer is have a set facing forward in the front of your trailer near the bottom of the side wall and then have another set facing rearward at the top/back of the trailer. This will maximize getting cool air into the trailer and hot air out.
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  • How to Pick Out Replacement Hubs for a Boat Trailer
  • In order to pick out the correct hub assembly for a trailer you are going to need know a few key pieces of information. The first thing you will need to know is the bolt pattern of your hubs. Since the figure you came up with doesn't match any of the 5-bolt bolt patterns I am going to need to to recheck your bolt pattern. For further info on this check out the FAQ article I attached on this. Next thing you will need to know is what spindle you have on your trailer. In order to do that...
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  • Minimum Trailer Tire to Fender Clearance
  • Generally speaking you will want to have 3 inches from the top of your tire to the fender of your trailer to accommodate for suspension travel. Having a little more wouldn't hurt, but I wouldn't recommend any less than 3 inches. I attached a review video for this fender for you to check out as well.
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  • What is the Maximum Amperage Draw of Trailer Brake Magnets on a Tandem Trailer with Four Brake Drums
  • Maximum amperage draw for 4 Brakes that are 10 or 12 inch diameter is 15.0 to 16.3 amps at 12 to 13 volts. The 14 gauge wire may be sufficient but for maximum braking effectiveness at full load capacity. I would opt to run 10 gauge wire. Larger wire will only help the effectiveness of the trailer brake system and 10 gauge is what we use when installing trailer brakes even on single brake axles with 7 inch brake assemblies. We offer Jacketed 2 Wire, 10 Gauge, Brake Wire, item # 10-2-1,...
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  • Raising the Height of a Travel Trailer that Rides Close to the Ground
  • If the leaf spring stack on your travel trailer is currently mounted to the bottom of the axle, there is an over-under conversion kit that you could use to gain a few more inches of height. However, this will change the center of gravity on the trailer and can lead to an increased chance of trailer sway. For 3 inch round axles you could use # K71-385-00. And for 2-3/8 inch round axles use # K71-384-00. You should not have to do any welding to use these kits. You would not want to...
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  • Electric Trailer Brakes Lock Up When Trailer is Plugged in to Tow Vehicle
  • The easiest first step here would be to try the trailer on a different truck, and see if the same problem occurs. If the trailer brakes are free until the trailer is plugged in, I suspect that something is mis wired. I would suggest examine the wiring where the break away system was bypassed and make sure that the 12-volt accessory feed is not connected to the brake wire at some point. Are you by chance using a 7 to 6-way adapter? If so, there are two accepted ways of wiring a 6-way...
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  • Can a Trailer with Electric Brakes be Towed by a Cadillac SRX Without a Brake Controller
  • It is possible to tow a trailer with electric brakes if your tow vehicle is not setup to tow a trailer with electric brakes. The brakes simply would not work. Electric trailer brakes are powered by a brake controller. Brake controllers are separate units that are installed on the tow vehicle. Most states have laws that require brakes on the trailer to be functional if the trailer exceeds a certain weight. If you will be driving the trailer on any main roadways, I would recommend checking...
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  • Checking Electric Trailer Brake Magnets for Wear, Shorts, Amperage, and Resistance
  • I would check the magnets for wear before going on to test them with a meter. If the magnets show abnormal wear or if you can see the windings beginning to show through the friction surface of the magnet then they will need to be replaced. To further test your magnets, first make sure the trailer is not connected when performing this test. If the trailer is connected, you run the risk of shorting out the brake controller or various other electrical components. To test the brake magnets...
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  • How to Measure to Determine the Correct Grease Seal for a Trailer Spindle
  • The # 168233 Double Lip Grease Seal has an outside diameter of 2.332 inches and an inside diameter of 1.688 inches. This seal is not compatible with a AF2527E seal with a O.D 2.312, because, even though the O.D. id very close, the inner diameter of the is seal is 1.750 inches and would not be the correct fit for the spindle diameter. You will need to take an accurate measurement of the outside diameter of your existing seal, or the inside diameter of the mounting surface for the seal...
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  • Spring Hanger Spacing Dimensions for a Tandem Axle Slipper Spring Suspension on a 14,0000 lb Trailer
  • The hanger spacing for a tandem axle trailer suspension setup can be determined, but you need to take into account the axle spacing needed for the overall diameter of your wheel and tire combination and the springs you will be using. Lets say that you plan on using 4 of the 5-Leaf Slipper Springs, # SP-232275, for 7,000-lb Trailer Axles, and that your wheel and tire combinations are the Karrier ST235/85R16 Wheel and Tire, # AM32764. The AM32764 wheel and tires overall diameter is...
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  • How Does The EZ Lube Spindle # R20384EZ Work On A Boat Trailer
  • On the EZ Lube Spindle # R20384EZ you do not need a grease fitting for the hole on the inside end of the spindle. This is an EZ lube spindle which is designed to allow you to put grease onto the bearings by using the zerk fitting on the threaded end of the spindle. You will not want to block the hole that is on the inside end of the spindle. When the hub is installed on the EZ lube spindle it will form a cavity around the wheel bearings and when you pump grease into the spindle through...
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  • How Do the Heavy Duty Ramp Springs Install on a Trailer and Ramp
  • Heavy duty ramp springs # RS16933RH and # RS16933LH install on the hinge of the ramp. I have included a picture of what this looks like for you. Not all trailers are exactly the same but this should give you a general idea of how the springs install.
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  • Clips and Clamps to Attach Wires and Wiring Harnesses to the Bottom of a Trailer Frame
  • There are many ways you can secure wires to a trailer. I would not recommend the use of tape as it will wear out quickly when exposed to the elements. Soldering is also not recommended because it is a more permanent method and you may need to change wires or move them in the future the hot solder would also melt the coating on the wiring, causing a short. If you can find some large enough, wire ties could be a simple solution. We have several clamps and clips that could work for this...
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  • How to Wire Trailer Brake Magnets
  • As long as one of the wires coming from the back of the hub is a ground and the other is a power, it does not matter which wire on the magnet goes to which wire from the back of the hub. I have included a link to a video of a magnetic brake replacement video that may be helpful. It is for a different size brake, but you it shows the whole process.
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  • Replacement Trailer Ramp Springs
  • We have several hinge pins like # HP412G that I have linked for you, but it sounds like you need actual springs. We have some heavy duty ramp springs like # RS16933RH and # RS16933LH if you happen to have a heavy duty equipment trailer like what they haul tractors and other large equipment on. For an open utility trailer you may be able to use a tailgate assist like # RA-27C. Or for an enclosed trailer we have springs that are similar to garage door systems. I have linked those as well....
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  • How to Check for a Bent Trailer Axle Spindle
  • Assuming your tires are in good shape without any bulges the easiest way to determine if you have a bent spindle is to take a straight edge that is longer than the tire and lay it across the tire parallel with your trailer frame and then measure the distance from the frame to the straight edge in front and back of the tire. If the distance is the same then the spindle isn't bent. Beyond that your best option would be to take the trailer to someone qualified in trailer repair to have...
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  • Where to Measure on Trailer Spindles to Determine Replacement Hubs
  • You will need to measure the diameter of the spindles where the seal and bearings ride. Check out the picture I attached that shows where this is. You will need an exact measurement so either a digital or dial caliper will be needed. To pick out the correct hubs you will also need to determine the bolt pattern of the hubs you currently have so that the new ones will be compatible with your current hubs. I attached an FAQ on how to determine this. If you get back to me with that information...
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  • Ramp Spring Weight Capacity and Left or Right Hand Orientation for a Horse Trailer
  • The right hand ramp spring, item # RS16933RH, and the left hand spring, item # RS16933LH, are differentiated by paint on the springs from the manufacturer. The springs with green paint on them are right side springs, left side springs are unpainted. Right side springs will go on the right side of a ramp and left hand springs go on the left side of a ramp. Both right and left hand springs deflect in the same direction the designation of right and left has to do with orientation of the stick...
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  • Recommendation For Screws To Attach Pressure Treated Decking To a Flat Trailer
  • I would recommend to use the treated torx screws for ACQ (Alkaline Copper Quaternary) treated wood for better corrosion and rust resistance. The treated torx screws like the Redline 2-1/2 Inch Long Torx Trailer Screw for ACQ Treated Wood, part # TFX250ACQ, are plated with a material that will resist the ACQ preservative used in treated wood, which is very corrosive because of the high levels of copper it contains. When using ACQ timber it is necessary to use double-galvanized or stainless...
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  • Choosing the Correct Ramp Springs for Enclosed Cargo Trailer
  • The springs you mentioned are designed for use on ramps that you'd typically see on a heavy equipment trailer. They're way too stiff to be used on a trailer door. The correct springs for your application will depend on what you are using the ramp for. The Ramp Springs you are asking about are best used for heavyweight steel doors on a horse trailer or for an enclosed car trailer. If one man can lift the ramp, a more lightweight option like a torsion spring would be a better option. We...
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  • Replacement for Oil Cap 21-88 for 9K, 10K, and 12K Oil Bath Trailer Axle Hubs
  • You have found it! Oil cap kit # RG04-300 includes the 21-88 oil cap you are looking for. The plug and o-ring are also included.
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