Sounds like it'll keep the seat in place while driving, but I wouldn't sit in it. EVER. If you hit something hard then who knows how well that plywood will hold. The risk isn't worth the little time/cost saved by not welding collars down to the floor.

john

> jeff, you dont need those brackets welded to the floor of the van.��you have 
> a plywood subfloor in your westy, all you do is drill 2 correspondiong holes 
> in the plywood, and insert brass plumbing fitting cups. thats what people do 
> when installing these jumpseats in their westys. the metal plumbing fitting cups 
> will hold the 2 nibs on the jumpseat base.