So I ordered a waste water tank and I got the big one...the 42 gallon barker 4 wheeled mammoth of a tank. I have a 38 gallon grey tank and a 30 gallon black tank. Anyway, I have a hybrid so no ladder on the back to hang it from and adding stuff to the bumper always seems like a bad idea to me. I was thinking of trying to find a way to put it on the tongue somewhere/somehow. I've seen people mount them underneath the camper, but mine is all closed in with that black corrugated plastic. Any suggestions for transportation of the empty tank while on the road? Really don't want it inside the camper if at all possible. Thanks!