https://www.steelsoldiers.com/showthread.php?11516-Crane-Ideas&p=109819&viewfull=1#post109819 <---- discussion and pics of various bed mounted cranes
So, here's the problem with all of the various cranes you can mount in these trucks: you have to build a really serious support system under the bed floor because the loads that the crane will impart to the floor will bend it and break it, even if you use the under-floor angle iron braces that most of these cranes come with.
It is such a problem that I have forgone having one of these in my truck, even though it would be really useful. I think if you are really serious about a crane, I'd get a piece of 1/2" thick steel and cut it where to can lay flat under the bed floor and tie in as many sides as possible to the bed crossmembers, inner bed frame, outer rail, etc.
On your gun safes, a crane won't cut it. The crane will likely run out of vertical travel before the bottom of the safe clears the bed floor.
People have made ramps for the deuce, but the issue becomes height, length, weight, breakover angle, etc. A ramp that is light enough for you to move it by yourself is going to be short. And the deuce bed is so high, the angle going up the ramps will be steep, really steep. You won't be able to move a safe up the ramps.
If you don't have access to a forklift, skid steer, etc., then I'd put a civvy trailer hitch on the truck and just buy one of those cheap 12' tandem axle utility trailers. They're low to the ground and have a ramp so you can handtruck or roll stuff up the ramp.
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