This is a great question. Had I never of used a camper before I would not know either. We just bought a BH270 as well and found that ours are labeled wrong. The gray(grey) water tank is the left side and our black is the right side. But the labels are switched. We normally would empty our tanks black first then gray. Imagine our surprise when grey came out first. It's not a big deal per say. Just annoying that the attention to detail isn't there.
With the other issues we are having with it, I may have been better off just staying tent camping. At least if my Coleman tent had issues I could call Coleman and they would send me new parts, no questions asked. Here it seems like a lot more hassle to get anything addressed.
From the LP gas lines, to plumbing not draining, fridge not working, wires hanging every time the slide moves in and out. trim pieces not installed properly. Door bumpers falling off while driving. I have no idea how this unit passed a quality assurance.
John