RockSliders->.188 or .250\"? Gettin ready to tackle some rock sliders. What thickness are your sliders? Should i go with .188" or .250" wall for some 3x3 box tubing? Anyone tell me the weight difference per foot i will see, gonna be about 11 feet of tubing, 5.5 per side, so will the added weight but protection of .250 wall be necessary? Thanks.