The weight is gonna be the same either way. The only weight that will change is what you have to carry to move it. As for taking it off and moving it to another vehicle, the winch should weigh somewhere around 90lbs or so. The tray is probably another 10. So you are lugging 100lbs, not such an easy feat if you are stuck somewhere. As for moving to another vehicle, unless he is prewired for a winch, its not gonna work. Unless you have a 25 foot power cord made of 00 gage wire, and I sure that will be another 20lbs to lug around, sharing with friends is just not practical. I get the idea, if I do a winch, that will be the route I go, not for sharing, but rather so I can leave the winch at home for the 90% of the driving I do.
As for the safari bar, I don't get it? You want a winch, inferring that you are going to do some significant wheeling, yet you want to add something flimsy that sticks off the front of the truck to reduce your approach angle, and probably do more damage than good in an accident?