Thanks for the input.
I don't think their prices are really out of line by RV furniture standards (yeah, that means they aren't cheap, but...). Also looking at tri-folds at rvfurniturecenter.com. They have a couple that unfold into a short queen (60 x 75) sleeping area without sticking out into the aisle as far as the current 51 x 72 hide-a-bed does (it goes all the way up to the opposite barrel chair, and the distance from slide wall to that chair is 91").
Before I bought this Bounder, the first runner-up was an Itasca Suncruiser 35U, and it did have one thing where it clearly beat the Bounder: the Rest Easy recliner sofa, that would lay flat and form a queen (short, I think) bed. One sold on eBay just a few weeks ago, and it would have fit in my 35H. I'd find some way to get power to it, if I could get one of those. I really liked it. Unlikely to find such a rare item before summer travel season and that hide-a-bed's just gotta go, so will live with either a jack knife or a tri-fold, I think.