Thanks Dinwitti....I went to trailerblocks.com and it seems to be the best solution so far. Guys lift trucks with rear axle blocks all the time with no issues, so why wouldn't it work for an RV????
I never heard of this place before but I will be contacting them soon....
From what I can rough calculate, if I put 2" blocks over the axles, the back bumper should come up about 3-4 inches...almost level!! thanks again.
As mentioned adding suspension to a trailers std leaf spring isn't the best or safest idea. In fact Dexter doesn't recommend the practice in a email to me.
Adding blocks to a truck rear axle is no big deal as the rear tires simply roll around corners unlike a trailer with close spaced axles in the center of a heavy tall box. Trailer tires actually side slip (side scrub) while backing or going forward around a corner. This add tremendous stress to the trailers suspension parts.
Now add a tall block with much longer U bolts and stress is multiplied on the U bolt/top plate and spring keepers.
For a heavy trailer the sub frame method is the safest and much easier on suspension parts
