Tire and Wheel Recommendations for a 37 Foot Dual Axle 5th Wheel Trailer with 235/85-16 Tires

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Question:

I have a 37 foot fifth wheel trailer with LT 235/85R16 - Load range G tires Goodyear G614 RST - rated at 3750# @ 110psi. The trailer recommendation is to run 110psi inflation due to nearly 14,000 lb. trailer weight on 4 tires. My present rims 11 years old is rusting under the paint and am concerned that I should replace them before I have rim failure. Question: What is the difference between AM20750 and AM20768? What is the load and pressure rating of each? And which would you recommend for my trailer?

asked by: Larry R

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Expert Reply:

The Dexstar Steel Spoke Trailer Wheel, # AM20750, uses 1/2 inch -20 bolts AND/OR 9/16 inch -18 bolts. It is rated for 3,750 pounds at 110 psi.

The Dexstar Steel Spoke Trailer Wheel, # AM20768, uses just 1/2 inch - 20 bolts. It has a capacity of 3,960 pounds at 110 psi.

The rest of the specs are the same for each. Both are 16 x 6 inch wide, have an 8 on 6-1/2 bolt pattern, and a pilot diameter of 4.9 inches.

The Dexstar Steel Spoke Trailer Wheel, # AM20750, would be the way to go for two axles with a total of 4 tires.

Make sure to use ST trailer tires. The ST in front of the tire sizes indicates Special Trailer. Trailer tires are designed with a thicker side wall to handle more vertical load. An LT is a light truck tire and light truck tires should not be used on trailers. The exception is if the LT comes at the END of the size then that would indicate it is appropriate for trailer use.

Some Load Range F tires actually have a higher capacity than some Load Range G tires. I recommend the Karrier ST235/85R16 Radial Trailer Tire, # AM10501. This is a Load Range F tire rated for 3,960 pounds at 95 psi. However, you will need to stay within the capacity of the rims at 3,750 pounds at 110 psi.

Trailer tires should always be inflated to the maximum psi listed on the tire to avoid excessive heat build up and failure. I have included a link to our FAQ articles on trailer tires and wheels.

expert reply by: Michael H

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Answer 1

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 2

According to Blue Ox, it'll take an experienced installer about 4 to 5 hours to complete the installation of their #BX1128 Base Plate Kit on a 2016 Jeep Grand Cherokee. The install isn't what I'd call super-difficult, but the installation…

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Answer 3

The 5.30-12 tires, being wider, are going to make more contact with the road. This means that the noise, and heat build up will be higher than a 4.80-12 tire but the rolling resistance will actually be less because the tire is larger diameter. The…

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Answer 4

The difference between an load range C and load range D tire in the same size is the capacity and psi rating. The two tires will still have the same dimensions and fit on the same wheel. The D rated tire has a higher capacity. For a ST175/80D13 like…

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Answer 5

The two sizes you mentioned are pretty similar and fit many of the same 15 inch wheels. The 205/75-15 fits rim widths of 5 inch to 6 inch whereas the 225/75-15 fits widths that are 5 inch to 6-1/2 inch. The 205 is 27.1 inches tall and the 225 is 28.4…

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Answer 6

Hi Paul, you’re definitely on the right track here, and I can help you narrow this down with confidence. With your tandem 3,500 lb Dexter axles and 33 inch spacing, both the Dexter EZ Flex part #K71-652-00 and the Lippert Road Armor part #LC53CK are…

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Answer 7

It sounds like you are speaking of the wires for the brake magnets. If this is correct, you will need to connect one of the wires to the brake controller output wire on your trailer connector and the other wire will need to be grounded to a clean…

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Answer 8

Even though I cannot comment specifically on the grease you used because I am not familiar with it, I can tell you the best grease for trailer bearings is a a grease with a rating of GC-LB, which just means it is made to withstand very high…

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Answer 9

The #84 spindle is just a common way to identify the spindle dimensions typically used for 3,500 lb axles. So instead of listing out the parts, people can just say they have #84 spindles and it's easier to know what fits it. The CE Smith Trailer…

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Answer 10

The BTR and BT8 denotations refer to the spindle, not the trailer hub. The difference between a BTR and BT8 spindle is that the BTR spindle uses a 1.063" diameter L44649 bearing and the BT8 spindle uses a 0.99" diameter L44643 bearing. In…

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Answer 11

Hey Donny! For your Dometic Penguin/Brisk Air 15,000 BTU AC model B59516.711C0-MX, the correct soft start is the #DMC93JF. This is designed for Dometic Brisk II electronic air conditioner units with in-wall thermostats.

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Answer 12

Hi Craig! Thanks for the pictures! ^___^ The Americana Aluminum Trailer Wheel - Split Spoke - 15" x 6" Rim - 5 on 4-1/2" #AM63FV is very very similar to the Sendel T03 wheel. To the point of not being able to tell them apart, to be…

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Tire and Wheel Recommendations for a 37 Foot Dual Axle 5th Wheel Trailer with 235/85-16 Tires

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