Last Sunday my Roo was delivered to my front door. The driver got lost and the camper was involved in a little mishap. It had to be righted a little and was severely stuck in some good ole mountain mud. The biggest reason I towed it without the WDH is for the reason you describe. I had concerns the frame was distorted and it would not track well. If I load her up with all the WDH sway stuff, you hit the nail on the head...we may not get a true idea if frame damage occurred.
Regarding the accident...we had the WDH, sway control and so forth on the previous trailer. I can without a doubt say if we towed without it, instead of the jack knife that happened, and we were able to recover the camper and drive it home, the trailer would have decoupled, rolled and been in a million pieces....
Bob, Tonya and the kids
11 Rockwood Roo 233S
08 Grady White Seafarer 228
08 Tundra 5.7 liter 4x4 crew cab TRD limited
08 Toyota limited 4 Runner Iforce V8 full time 4WD, tow package