2011 31.5RLTS with 2011 2500 SRW
We just bought a 31.5RLTS to tow behind a 2011 2500 SRW CC and thought we'd share some of the adjustments and work necessary to end up with a level tow with adequate clearances.
First, the Chev Duramax trucks were all treated to a large increase in GVW (10000lbs for this truck) and they basically did this by increasing the frame strength along with bigger springs, etc, which resulted in higher bed heights (56.5"on this one--actually, all the new trucks have about the same height issues). So, combined with the deeper beds that all the later year trucks have, leveling everything while maintaining adequate clearances was a real challenge.
The trailer was ordered with the 16" wheels and it came with the springs on top of the axles. However, we still needed to raise the trailer 3" to get it level and that was accomplished by using a machine-shop crafted steel block along with new heavy duty U-bolts. The hitch we used was a Superglide (18K) and it was mounted using the 3" optional lift kit in order to obtain pin box to bed rail clearance. Pin Box is a MorRyde and it had to be in it's full up position. A 5th wheel tailgate was necessary also.
In the end, we ended up with 7.5 to 8" of clearance on the bed rails with the trailer level. The little bit of extra clearance will be nice when on some of the CA desert dirt roads. We also added "wet" bolts and plan on welding in a horizontal cross braces at the equalizer and at the spring hangars.
Kind of long but thought some of this may help provide a starting point if you have newer truck and a late model Jayco.
George & Kim Edgerton