Dogshooter, 
Yep, seems like a heck of a price but I feel better due to the heavy construction.  I can pile 200# on top of this thing and not worry about splitting the thing open even after an all day ride in mid summer.  Been there, done that, got the T shirt.  Flipped the wheeler over badkward on a steep hill about a year and a half ago and never lost a drop but the wheeler wasn't quite so lucky nor was I.  I'm sorry but I just can't bring myself to strap a can on the back over the end of the muffler.
By the way, the one I have has a cap with a hose attached that hangs right over the cap on my bike.  When I need fuel I just remove the bikes gas cap, slip the hose down the tank and unscrew the aux tank cap until fuel starts to flow.  This way I don't have to unload my junk first.