I have a 89 Full Size Jimmy. The current spare tire has the rack inside the bed. I have found an aftermarket rooftop one that would fit. I am solicting advice on whether 1. it is safe, I have a 5 in lift and am concerned about being more top heavy and 2. would it look to bad on the roof. 3. How difficult is it to re-enforce the 1/4 to put a rack on there? Thanks for any help that is offered