None of the Bs you mentioned so far in Pleasure-way or Leisure Travel Vans is going to qualify as a decent four season van. None of them are very well insulated and that period most all use was designed for above freezing temperature expectations. Also your worry about ground clearance is overstated or over worried. Class Bs are not Jeeps. You will rarely drive them anywhere where it might be a concern. Class Bs are just not built for that kind of abuse with everything you normally carry inside.
In the 2006 - 2014 period I think only Sportsmobile was designing and building "active" Class Bs on 4x4 platforms in your price range, and maybe of more concern is height and Sportsmobile like pop top vans gave you more capability driving down seldom used lanes with overhanging tree branches that most all pickup trucks had long knocked away.
