It's maybe a little more expensive but the Phoenix Cruiser offers slide outs in the B+ category. Our local dealer has a 21" with slide that looks very nice.
I just noticed on the Moturis website (www.moturis.com) that they have a new D-21 'supervan' for rent, and it looks like the Trail-Lite 21 ft. They have locations around the country so it might be a good way to try one and see if you like it.