You are only an hour and a half from Columbia, you really should take your Sportsmobile and pop down to look at Tigers. This would let you compare space, features, and build quality.
4x4 Sportsmobiles and Tigers are not conventional RV's and are not priced like them. A Tiger competes with Earthroamers, All Terrain Warriors, GXV, Earth Cruisers and some 4x4 pickups with things like the XPCamper or a FourWheel camper.
When you move into this market you pay a lot for greater autonomy and rugged running gear. If you don't need that, Winnebago (and others) make some nice Sprinter based RV's. Just don't expect them to have big water tanks, 4x4, serious batteries and solar, etc.
In our case, the Tiger priced out at between $50,000 and $200,000 less than the competition.
Everyone's needs are different.