What is the max length travel trailer you think is practical

When lengths are quoted here, some may be just the length of the box, or the overall length and maybe they are quoting the number used for the model.

Personally I want nothing over 30' overall, and a bit shorter would be my preference for traveling to all varieties of camping spots. Dragging around more than what is necessary just adds to the stress. Nearly everyday questions come up on this forum about the ability to tow or use certain roads and certain campgrounds with a large trailer.