Any electrical wiring for lights needing repair?
Not that I am aware of - however it has been sitting for a few years.
Does the hitch need to be replaced?
The length of 11 ft - does that include the tongue/hitch or no?
11' include the tongue/hitch
What are the interior measurements and dimensions?
The walls are only 1/2 - 2 inches depending on if there is a panel or just metal, so you could subtract 1- 4 inches.
Would it be reasonably easy to replace the sofa with a pullout bed?