I am in the process of specking out a new inline trailer and am interested in input on what systems work best to tie down ATV's (only ATV's). The concerns I have with recessed D-rings is if the bolt heads will cause issues in moving the snowmobiles from side to side, next will recessing the D-rings eventually cause floor issues (if I go that route, they will be reinforced underneath). I have not seen the E track system in person, is it stout enough to use as a hold down for ATV's/Side-by-Side's)? Same question on if the track system causes any problems when scooting a snowmobile around sideways? Any other thoughts about what others are using and work well? I am not trying to cut corners, would like something that works well and will last without causing problems in the future. Thank you for your thoughts.