[fcatwo]

The forces generated by a WDH would be the opposite (up) of those that bent his frame --- correct? His problem would be best duplicated by significant trailer tongue load on a hitch without weight distribution. IMO the way to avoid this problem is to stick to the manufacturers various weight limits and use the lightest WDH spring bars necessary to handle the tongue load.

Not to hijack the thread but to add to it; I posed a question over on RV-Net a few days ago asking if anyone knew examples of unibody frames failing because of WDH use. It has generated the usual opinions and speculation but the only example so far is of an Astro being used to tow a 6,000 trailer. The body was bent to the point that the side/rear doors were wedged shut. The owner was able to bend it back with some sort of power puller. Apparently the Astro is not a true unibody but a "body-on-frame" who's frame does not run all the way back. Something else interesting I gathered from comments there is that bent hitches and frames are not unheard of in the RV community.