I am going to install some seats also, thanks for the information. Instead of drilling into the structure I think I can have a friend weld me a sub floor to sit on top of the factory floor. There appear to be four reinforced mounting places where I can bolt the removable sub floor to the van, two on the bulkhead behind driver, passenger seats and two on the pillars by the rear doors. If that doesn't seem to be strong enough it looks like it is possible to bolt into the holes where the factory tie down rings are bolted .
The front of the sub floor will be snug up against bulkhead , along with the bolts, that would not allow sub floor to move ahead.When the sub floor is removed then there will not be any floor mount brackets into the factory floor . Quarter inch, or 3/8 steel square tube , with plate decking , then cover with carpet.
The van will be mostly used as a camper so it would be desirable not to have the seat floor bracket holes. Once or twice a year I will probably be using the seats.
I will start a thread and post pictures once it gets started.
Last edited by ramminjammin; 04-09-2015 at 11:02 PM.