So I purchased a used CVT Mt. McKinley RTT (I am really stoked about getting this thing!). I am fabricating/building an M416 in a pretty unique fashion for this camping/overlanding adventure(s). My question is how far apart are the rails that are bolted to the underside of the tent? I am making a rack and need to know how far apart they are so the supporting pieces will not interfere with the brackets on the bottom of the tent.... any help would be greatly appreciated.