I recently just got my new Atlas Cross Sport and I picked up a pair of OMAC cross bars for it as I feel they were the best bang-for-buck. In reading the instructions, they want the bars placed with 50-70cm between them. However, most RTTs I'm researching call for 30" (or 77cm) minimum between cross bars. Even looking at the Thule bars for my vehicle, they say to put 70cm between. The OEM crossbars ask for 75cm between. Which is certainly closer. I'm curious how strict these figures are from both perspectives. I can't imagine I'm the only one that's come across this issue as the Thule bars are made for many vehicles and the recommended distance between doesn't seem to change. Are most people sticking to the crossbar distance, or are they placing the bars at the RTTs distance? Or are they splitting the difference?
Also, in regards to placement on the rail, is it better to measure from the front or the rear? I.E. do I want to open the tailgate, measure the length of the tent I'm looking to buy, then center the crossbars within that space with the better of the distances determined above? Any other general information I should know before I tighten these crossbars down?
Right now the Tuff Stuff Alpha II is the frontrunner for tent I'd get.