Heh. I think I could unload it myself.
Borrow a low trailer from a friend, back the trailer up to the curb at the street so the trailer wheels and axle are at the lowest point, then come in with the engine hoist and some car-trailer load straps on the ground, lift the thing with the hoist, then pull the trailer out. Lower the bench down on to car dollies, slowly roll it across the driveway and into the shop. Get the hoist out again to get it up the 4" step, then into position to lower again. Lower it on to some wood cribbing or the dollies, then use the low profile floor jack to raise it enough to get the cribbing out from underneath.
Should take about a day...
When I took the utility bed off of the '82 Dodge D350 I used two engine hoists, came in from the back on each side, let the legs of the hoists straddle each wheel at the rear axle, then after lifting the bed off, pulled the truck straight out. The buyer backed his trailer in under the utility bed with the wheels being straddled by the hoist legs, then we very carefully lowered the hoists until we had it safely placed on his trailer. That dang utility bed was HEAVY. It was probably 3/8" thick, had a vertical cab protector, a recessed box for a gooseneck trailer ball, and had an over-engineered ladder rack welded on to boot. At least it was for a short bed.