I don't think the weight would be a problem. I've hauled enough lumber on top of mine to well outweigh a 14' jon. The hard part would be getting it up there. Maybe you could strap a couple 16' 2x4's up there, with the back of the 2x4 where you could still open the hatch, then you could lift the front of the boat to the 2x4's then pick up the back of the boat and slide it on 2x4's.? Just thinking if you were by yourself....