I did the axle flip on my 19.5' Okanagan. Then went to largest 14" tires. That was fine with the Chev. Got the Dodge and first time out, smacked the box. Back to my fabricator. We jacked the trailer high enough. plasma cutter to cut the spring hangers off. Then welded a 2X4X7' piece of 3/16 tubing to each of the frame rails. Then reattached the spring hangers it took an afternoon. Trailer now a foot over stock.
http://s1283.photobucket.com/user/rickcoles/library/Fabbed up a bracket for a set of 4 step scissor camper stairs.