Phoenix Cruiser makes nice B+ models, and Nexus RV makes both B+ and C models.
I like full cabovers because it gives additional storage space of light, but bulky items, such as bedding or outdoor items (camp chairs, tables, tents, coolers) that one can put some sort of layer between those and the cabover mattress so the mattress doesn't get soiled. Plus, some cabovers can have nylon webbing (mainly intended as a "kid catcher" to keep the wee ones from falling out), which can also help secure lightweight cargo.