I used a 57 panel for various business stuff, including carrying lumber and misc const materials, and also bins of apples [42"x48" and as much as 1000#] - the ply will fit thru the door at a slight angle, and lay flat between the wheel wells - clear floor to the back of the seat on most year panels is 8'2 or 3", and w/ the 'buckets' that were stock in the 57 I could put a 10 orchard ladder in and close the doors
do it - be the best advertising you could ever have!
Bill