Haven't driven by the 350M yet but looked at and ad for one for sale and its showing 2 axles so maybe the site I had postmarked was outdated or something...still going to do a drive by anyway. Also, the 376 doesn't look very bike friendly to me as you would have to leave the bike outside in order to have access to the bed...not something I would want to do. Think about if your driving and want to pull over and rest...no bed unless you unload the bike. Get the unit with the bedroom in the front and power beds in the garage if you need extra sleeping space like the 399 or the 388M if you don't need the extra capacity.