In Jan this year, I started using a 16ft trailer, replacing my old 12ft. I never strapped my 52' Exmark down and never had any problems with it moving. Since using the 16ft I have had trouble with the mower moving aroung on the trailer. With the dual axle and the heavier weight of the trailer I had assumed everything would ride better. Even my 36 stander and small push mower that is strapped donwn seem to move more now. Any ideas??