Your best option to lift your 2015 Keystone sprinter 5th wheel camper is the Correct Track Trailer Alignment and Lift Kit - Tandem Axle # RR23QX. This adjusts in increments of 1/4", and can give you up to 2-1/4" of lift. It also helps to keep your axles aligned and parallel to each other.
The way it works is it bolts under your suspension hangers and adds length to them.
If you want blocks rather than hanger extenders, you will need to check your axle tag to see what axle you have. If... view full answer...