Choosing Bigger Tires to Increase Trailer Ground Clearance

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Question:

Hi - I am looking to lift my camper 3900 lbs dry weight up about two inches for better ground clearance and the only way is to increase the tire height. I run 225/75R-15s on it now. Is there an acceptable alternative tire I can use to increase the height ? Many thanks!

asked by: Brett P

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Expert Reply:

It depends on how much clearance you currently have around your wheels. Ideally, you should have 3 inches minimum clearance between your fender and your wheels and an inch minimum between your sidewall and trailer frame/wall. As your wheel size increases, your clearance decreases so please measure with that in mind.

You current tires are 225/75/R15 similar to # AM32680. As you can see, this tire has an outside diameter of 28.4". Going up two inches would bring you to a wheel and tire like # AM35010 with tire size 235/85R16. This has an outer diameter of 31.61". That will only lift your trailer by 1.6 inches by the way.

Another factor to note is bolt pattern. The wheels I suggested have bolt pattern 6 on 5-1/2". Please check the bolt pattern on your current wheels since your new ones need to match that, no matter what size they are. I attached a helpful article for figuring out your bolt pattern.

If you let me know how much fender and sidewall clearance you have and what bolt pattern your wheels are, I would be happy to make a recommendation!

If you don't have enough clearance, there are other options to lift your trailer like flipping the axles with a Dexter Trailer Springs Over-Under Kit part # K71-384-00 or part # K71-385-00. If you have leaf springs, you can also replace your hangers with taller ones like # APT5 to get some extra height.

expert reply by: Evangeline M

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Answer 1

Hello Julio, thanks for reaching out. The appropriate spring for your trailer will depend on the weight capacity of each axle. Ideally the springs will match the axle capacity. Like for example the 4-Leaf Double-Eye Spring #DX45CR is rated for 2,600…

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Answer 2

Your picture didn't make it through but it sounds like you would like to upgrade your tire and wheels on your trailer. You may substitute a 14 inch tire and wheel as long as you have both the wheel well height and width clearance for it, the…

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Answer 3

Hey Stephen, The 72" long versions of the MORryde Cargo Siding Tray are the only ones with an 80% extension. These come in the follow widths: 72" x 20" #MR74FR 72" x 26" #MR77FR 72" x 29" #MR49FR 72" x 33"…

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Answer 4

Each of the 86-1/2 inch axles we offer, such as the 5,200 lb Dexter Trailer Axle w/ Electric Brakes #8327816-EB and 6,000 lb part #8327826-EB have 71-1/2 inch spring centers. So what you would have to do is get new spring seats welded on at the…

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Answer 5

Thankfully, Grand Design actually has some parts info we can reference, unlike any other manufacturer, so I know that your 2019 Grand Design Reflection 28BH does have 5,200 lb axles that measure 86-1/2" hub face to hub face and 68-1/2"…

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Answer 6

The spindle on your Dexter axle is going to be similar to the #84 E-Z Lube Spindle #TRU74FR in the image below. You can see there is a hole in the spindle where the grease will push through into your inner bearing. From there it will move along the…

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Answer 7

Thanks for the picture! I couldn't get all the information I needed off of the tag but our best option to replace the axle on your Keystone Montana is the Dexter Trailer Axle w/ Electric Brakes item #8327826-EB. This axle has a 6,000 lbs capacity…

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Answer 8

The Dexter Trailer Axle item #8327826-EB is a 6,000 lbs capacity axle. The Dexter Trailer Axle item #8327816-EB is only rated up to 5,200 lbs. This won't matter because they both come with hubs and brakes but the item #8327826-EB uses a outer…

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Answer 9

Not the trailer axle itself, but you will need to put the brakes, bearings, seal, and hub on the axle Dexter Trailer Axle w/ Electric Brakes #8327826-EB to completely set it up. The kit comes with grease for you to add to the bearings prior to…

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Answer 10

Since your axles are rated for 6,000 lbs. you will want to use 6,000 lb. leaf springs. We have a few options for 6,000 lbs., the correct one will depend on the length of your current springs (measured eye to eye). I have included those options below.…

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Answer 11

Adding the 5-Leaf Double-Eye Spring for 6,000-lb Trailer Axles - 25-1/4" Long #e34SR will only increase the height of your 2014 Grand Design Reflection 303 LS if your springs sit on top of the axle. The leaf thickness is 3/8" with an…

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Answer 12

Assuming you mean you have a 35" wheelbase when you say you have a 35" axle center then yes, the MORryde Premium Rubber Suspension Kit for Tandem Axle Trailer - 35" Wheelbase - 5.2K to 7K #MR47ZR will be compatible with your 2018 Grand…

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Choosing Bigger Tires to Increase Trailer Ground Clearance

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