I currently have a fixed rack on my trailer that is too high for my taste, and I want to go to a telescoping rack to have a low position for transit and the ability to raise it at the campsite to take advantage of the RTT annex. Most of the telescoping racks I seen have the larger tubing on the bottom with the smaller tube attached to the rack and sliding into the larger base tubing. Is there a strength or other reason for this? My thought was that if the smaller tubing was on the bottom and the larger tubing slid over that, there would be considerably less debris (dust, mud, sand, etc.) that could get into the larger tube. I'm sure I am missing something here, and any help would be appreciated.