wopachop, that is an interesting point about steep angles. We often encounter "water bars," which are a cross between a speed bump and a ditch. A water bar angles across the roadway at a diagonal, in order to avoid erosion as the water flows down the roadway.
Those obstacles often cause my truck and my trailer to take very different fore and aft "pitch" angles, as the wheels slowly cross the vertical plane of the water bar. Lots of stress on the running gear -- much steeper than the worst gas station.
So if crazy angles are bad for a WDH, maybe it is a good idea to take steps to protect the hardware when towing on rough forest roads?? (Again, bear in mind that I know nothing about WDHs, so my comments may reflect my ignorance!)