For the ultimate in support , use a fairly heavy piece of lumber that spans across a few more joists than what your load measures. a 4x4 or so would be plenty sufficent for a Bronco top. Then run your eye bolts up (between joists) through the drywall and through the lumber with a big ol' nut and washer on top. That will spread the load over more joists that way.
Keep in mind that the size of your ceiling joists is the main concern. If you only have 2x4's spanning a long distance , forget about it.
As far as the hoist system , the idea I liked best that I read about here at CB , uses pulleys , and four pieces of aircraft cable that terminate to one bigger aircraft cable that is controlled by a small atv winch rated for like 1500lbs , costs about $70 for a cheepy winch. The winch was mounted to the wall at an easily workable height and powered by a car battery or jumper cables from the bronco.
Once it was winched to the ceiling , chains and eyebolts were used to lock it in , in case the lock on the winch failed.
Most guys lift the top by hand first , enough to get some two by fours under the back corners and front bed rail corners , BE SURE TO SECURE THE TOP TO THE WOOD USING SOME TYPE OF WOOD SCREW , SO THEY DON'T SLIP OFF AND CAUSE THE TOP TO FALL.
Personally , I'd use a 4x4 or two 2x4's on edge and screwed & glued together to make your own lam. beam. for under the top.