Thanks gents. .095 is .1lb per foot lighter than .120. Won't be enough to make any kind of difference in weight but I'd venture to say .095 would be strong enough too. Its only .0125 thinner per side. My PRP seat sliders are even smaller on the OD, not sure on thickness.
I have done 1" x .120. Or just mounted off the main x members. I prefer the latter, because no extra tube needed! Plus, with the 1"... if the tubes get too long, my fatass can flex them a little.
The reason I picked the 1" x .120 was because I have lots of it for building bedside mounts, etc. If I were to do it all over again.. I would probably get .095 for all that stuff..... And save a whopping mcqaurter pound with cheese over the entire truck. LOL