A slide in electric lift dumper would work well. The over the cab protector shield is nice to have. This could cost as much as $2500.00 installed if new. Used ones can be found for about $1200.00. A cheaper alternative is to stand a spare tire in the bed behind the cab. Have a chain attached to the center of the tire. The chain must be long enough to extend out of the bed and be locked around a tree or post. Then drive forward pulling most every thing out of the truck. You will need a rake to finish the clean out. Not a bad way to go.
You might also do a search. Many discussions on this topic have been seen here on Lawnsite.
Hows the weather there in Florida? Cold here in Cleveland!
Prosperity in the new season!