Good idea! I have a horse stall mat that I got to use under the truck camper, so I may just cut that so it fits behind the rails! We have a shakedown trip scheduled for the end of March, so my plan is get the trailer packed with all of our camping gear, fill the water tank, and stop at a scale and get some weights.
Right now, the hitch is at its highest setting, and so is the pin box, so dropping both of those one notch will probably get the trailer pretty level, but have to see what it does for truck clearance.
Question for BD3 owners: do you deflate the airbags when not towing or leave them at whatever pressure they were at?