How Much Lift Does Installing an Over-Under Kit on a Trailer Give
Question:
I have read where you have suggested the potential safety issues doing this type of conversion. My trailer is a single axle with ST185/80D13 load rating D tires and are bias ply. I would like to do the axle conversion so I can put 14 or 15 inch rims which are a 5 x 4.5 bolt pattern and put a load rating radial instead of bias ply and I can also get tires with a heavier max capacity which wont leave me right at the limit of the tires abilities which is where I am now. So considering the benefits of going to tires that are radial, have a max per tire weight limit of 2200 lbs per tire vs 1660 lbs, are slightly larger in rolling diameter so it should be easier on the bearings I think the cons are few. The only problem I have is trying to determine how much space I will have because right now I have about 1.5inch of clearance on all side of the tire from the wheel well and to the frame. If I get a few inches of lift Im hoping to be able to put a tire and wheel combo under it that will fit if the overall diameter increases by 2-3 inches. My trailer is a 2003 Coleman Utah with a GVR of 3050 lbs and a GAR of 3450 lbs. The tongue weight is supposed to be around 400 lbs if the trailer is loaded and balanced right.
asked by: Aubrey
Expert Reply:
When you use an over under kit like the part # K71-385-00 that you referenced you will gain the diameter of your axle, the thickness of your spring seat, and the thickness of your leaf springs as a lift.
Also what you should consider is that when determining how much fender clearance will be left after going to a taller wheel/tire. Only half of the added diameter will be taken up in the fender well. So if you go with a 2 inch taller tire you would only lose 1 inch of fender/tire clearance.
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