Hello, I have been looking heavily into expediting with a straight truck. I would like to go with 20+ plus and I think I would like the option of being able to access the cab from the inside of the box or vice versa but from what I've seen, the trucks that go beyond 15 ft. do not seem to have that option. Is this some type of legal issue that does not allow that type of access once the vehicle reaches a certain criteria? Do you have the option of having a custom designed access to the cab if legalities do not prevent the owner from doing so? For those of you that drive 20+ ft. trucks, do you just access the freight/living area (for lack of a better term) from the rear door and if so, are you able to lock it from the inside? Thanks!