What about the truck made it particularly difficult? usually big box trucks are pretty straight forward.
It was a small trailer, and we had some wheel wells that gave us trouble. But we did a vertical center hinge on one side, which was a big mistake. Other than that, it was hard not to get some wrinkles here and there, especially at rivets.
What material were you using for the install?
We had a local wholesaler print the graphics, and they told us it was Avery RS cast --- but there were no markings on the back of the liner, which makes me wonder. But it was easy enough to work with. I think it's just lack of skill on our part.