Thanks and I used some galvanized strapping with the holes in it from the hardware store. I bent it to fit and then covered it with the rubber window flashing. After quite a few conversations with the VTS guys and others we felt that three straps would be more than adequate for the max load of 150 lbs or so with the weight of the tank and full of water. If you look at my blog post from the 8th of May (msstreamy.blogspot.com
) I have a link to the plans that I sent over to VTS. For the plumbing I basically went for drains and connections lines on the lowest points of the bottom corner of each tank on the curb side. This put the drain line out of the back of the aft tank right on the side of the black tank pan. I put the 1.5" dump valve there before I made the corner and along the back of the black pan to tie into the main dump there.
TennTex, McCrosti and I have been discussing things over on TennTex's thread here
So far on the first outing I've been pretty pleased. I didn't have a lot of grey water since I didn't have the bathroom water hooked up. But I filled all the tanks with clean water to test and it works good. With the VTS tanks you'll never be able to drain them fully as the fittings just can't be on the bottom of the tank. I figure in the fall during my winterizing project, I'll jack the tongue of the trailer up and then maybe give it a bit of a slope to the curb side and I should get a pretty good drain.
Good luck and keep us posted!