Here's how we installed L track + two sienna seats
it's doable. just be aware that the floor undulates...this photo is a junkyard van that we used for measurements.
you'll need to account for the depth of the undulations, the depth of the flooring materials (if more than one) and adjust the depth of the L track accordingly.
we installed
8-foot undrilled L track in the low undulation so we could bridge the two holes with a 1/4-inch piece of aluminum underneath the floor.
above the floor, we installed a
1/4-inch thick aluminum spacer beneath our L track to get enough clearance so the
unwin brackets would move easily
there are numerous floor crossmembers underneath the floor. we measured a pilot hole and then in 1-inch increments to find proper bolt placement to avoid the crossmembers. i think we have 20 bolts per track?!?
you could also eliminate the spacer and remove enough flooring to allow the unwin brackets to move back and forth, although this may not look the greatest.
also check Otter's seating -
https://www.sportsmobileforum.com/fo...tml#post255687
we didn't have the really helpful mg/expovans/basefab template that Otter used and we cut thru the floor since there was too much to remove. we were only out 1/16-inch on being parallel and perpendicular. we don't take pictures during projects, so we can't offer a visual reference during the process.
we can take pictures of the final product if that helps...