Don't get anything where the slide has to be out to use the bed. Dumbest design ever. You want full access to the bed no matter where you want to park. Especially parking lots and overnight rest areas.
We had a B but it was a pain making up the bed all the time and wasn't really big enough for two people with different sleeping schedules. When we decided to trade up the one thing my wife demanded it have was a full time queen bed that we didn't have to climb over each other to get in and out and didn't have to sleep with a wall in our face.

This is ours.  Don't know how big your bike is but we carry two full size Harley's so a tandem axle is required. Get a tandem axle so if a tire lets go there's a second on that side so the trailer isn't destroyed along with everything in it.
We use the cab over bed area for storage. Took the mattress out. It holds spare clothes, bedding, dry goods, etc. We call it the attic and it's very handy having all the extra inside storage space.