That should work as well. With better access than through the floor. My setup has a 4-5" space between the camper sides and inside of the bed walls, so floor is the only bolt-thru option.
Well here she is still sorting out the little bits but the heavy lifting is done. I ended up bolting through the floor as it turned out to be the strongest option. It's not as bad as I feared to line it all up thankfully.Great looking setup. Very form fitting to the service body. Look forward to the finished dealio.