I would use a piece of plywood at least 12 in wide at the bottom of the door and use many bolts on each side. The 34s are pron to a crack in the skin in the upper right corner of the door even while on the frame. No need to help that along.
If you are going to jack the body rather than lift through the windows I would position the only 2 braces 1/4 from each end using only 3 jacks, 2 at one end and 1 at the other. You may have to move the brace to get under the original jacking points if the floor need replacing there but moving the brace one rib may be OK.
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles