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Old 07-07-2015, 09:15 PM   #1
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Wheel Clearance on a 5er / Noob 5er help on suspension...

I've got a "new" Keystone trailer - toy hauler that's about 36'. Empty weight is 12410. GVWR is 16500. Dual axles are 7000 lb lippert with a "correct track" alignment system.

I'm towing it with a DRW (Dually) Ram 3500 that uses an auto-slider 5th wheel hitch.

This is my first 5th wheel.

I replaced the factory "Trailer King" tires that were pretty maxed out at GVWR with Sailun ST235/85R16 (factory size). Appropriate valve stems and wheels. These tires weighed about twice as much and although they were the same size, they were slightly taller - mostly tread depth.

First big trip this week. Hauling a 4-wheeler, slightly off center, but nothing else particularly large in the cargo area. I had it weighted on a CAT scale, and the weight on the trailer axles was approximately 11k lbs. Well within spec for 7k axles.


The issue is that I've got about 2.5" of clearance between the top of the left rear tire and trailer "deck". No indication of touching in 1200 miles of towing, but I'm clearly not loaded to anywhere near gross.

Contributing factors are:
1) Slightly left of center load (400 lb 4-wheeler)
2) 30 gallons of fuel (<200 lb) that's also left rear
3) The Ram 3500 DRW appears to provide a "nose up" attitude for the trailer. IE - I bet I've got more weight on the rear axles.


I haven't asked Lippert if 2.5" of clearance is in spec, but I'd like some advice. As it's a toy hauler, I believe the axles are already flipped.... How much effort should be put into leveling the trailer to the truck to balance those axles? Should I be concerned with 2.5" of clearance...

Thnks..
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Old 07-08-2015, 12:34 PM   #2
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2.5" is a little close, I would try to level the trailer if I were you. I bet that will give you a little more clearance.

Those Sailun are awesome tires, I love mine.
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Old 07-08-2015, 12:48 PM   #3
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Have you looked to see if there are adjustment holes on the spring hanger brackets?
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Old 07-10-2015, 08:58 PM   #4
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2.5" is a little close, I would try to level the trailer if I were you. I bet that will give you a little more clearance..

So, being a 5th wheel noob.. how do you do that? Seems like you'd need to lift the trailer?

I didn't see adjustment holes. There likely is some adjustment - that's the only way I can think of that "correct-track" would work...
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Old 07-12-2015, 09:01 PM   #5
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If you have enough clearance you can lower your hitch. If not you would have to lift the suspension.
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Old 07-13-2015, 10:42 AM   #6
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If you have enough clearance you can lower your hitch. If not you would have to lift the suspension.
I looked at that, I have an auto-slider pn 4400 - no height adjustment. So it's either lower the truck or raise the trailer...
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Old 07-13-2015, 12:04 PM   #7
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2" spacers can be placed on top of the axle to raise your trailer slightly. You might have to get a couple of new U bolts made at a truck alignment shop to do this however. It's not a particularly difficult mod to make with the right parts.
The hitch on most fifth wheels also can be adjusted up and down.
A combination of the two might get your first class trailer/truck to the proper level position.
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Old 07-13-2015, 11:17 PM   #8
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Before you do all this lifting you need to measure the height. If you have an ac up front put a straight piece of something on top of the Ac so that it sticks out over the side and get your height. 2.5 inches is close . Those 85 are at least an inch taller then the 80s.
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