I have a 98 FL70 with a 24ft box... The box rides very rough. The smallest bump in the road feels like I ran over a speed bump at 20 mph. Alot of my loads are shifting and falling over. What should I check first to stop from bouncing around so much? It has air ride suspension. The cab rides pretty good. It has a 70" sleeper on it, if that matters. Should I replace, shocks 1st or leaf springs, air chambers??? Thanks for any help!!