It is not the length of the tent, but rather the design. A-Frame and Pyramid-shaped tents and tarps slope from peaks slantwise to the ground. In most such tents, the slope of the walls greatly limits the amount of space that can be used comfortably. Add insult to injury by supporting these tents with trekking poles that obstruct access and exit. The name of the game is ultra light weight, and comfort be dammed. Add more insult to injury with walls that are not stable and taut.
That is why I commented at length just above about how well Tarptent has done with its latest version of the Moment. However, I sense you are looking for something a lot larger than what most backpackers require for comfort. So suggest taking a look at the TarpTent Stratospire 2 person. The maker is very thorough in providing information, and the tents are reasonably light in weight. And with a large tent, not a solo, the upright poles are less of a problem. And there are still larger tents on the site.
Yet if you are going to be cycling and possibly pitching on asphalt in campgrounds, particularly windy ones on the great plains, you might want to look for a tent that is self-supporting, and does not depend on stakes to keep it upright.




