There have been lots of posts about whether an ATV will fit with a tonneau and Ramboxes and most people say no, but there are so many permutations with the options and different ATVs that it's impossible to make a blanket yea/nay statement. I can tell you that Honda Rancher with the Truxedo Pro X15 will fit into a 2500 with Ramboxes. There's no wiggle room, but it's definitely doable.
