Appreciate the quick responses.
It sounds like WRT rough roads, it depends on your point of view about securing cabinets and such. I've also had everything wind up on the floor of our Four Wheel camper many times before coming up with a packing system and internal lash down points to mitigate the issue. With the limited suspension of the Escape trailers, I expect that long stretches of washboard could indeed be painful.
Doug, your point about not shaking up the mechanical components is worth considering. I think we would avoid beating up the trailer over extended travel on rough roads, and go really slow if it's unavoidable. I also appreciate the weight argument for the larger campers. But I think the 17B is too small to be a useful step up from a truck camper. If I were traveling solo, or we were 10 years younger, I think that's what we would get.
What eludes me, having never owned a 5th wheel, and hopefully some 5.0TA owners will chime in, is the issue of the overhang contacting truck rails/tailgate on short stretches of uneven dirt "roads." The kind that aren't necessarily rocky or particularily technical, but may be rutted or unevenly sloped where the articulation of the truck and the side-to-side sway of the trailer could cause contact between the two. Or short ledges that force the truck and trailer to hop over at differnt times, with the possibility of the tailgate contacting the trailer. In these situations, I would expect that a tow-behind would be preferable, but I'm just not sure how much worry to put on that.
Thanks to all for your comments!
Mark