I currently have the RRT on my 5th gen works great, wanting to move it to my 93/80. looking for opinions form owners of this GFC RTT mounted with GFC 80 mounts. was there a noticible difference with the wieght added to the roof. I.E. top heavy, noise, lost mpg. I understand CG and areo dynamics so please I am only looking for people with 1st hand experience or a friend that had or has the GFC /80 combo.. please not opinions or comments..