LS, my thoughtson your vehicle are that it needs to move away from being a Star Trek ship to being an Imperial vehicle. The fact that it has a trailer section suggests to me that it would be a utility rather than offensive, it could possibly be an ATAT support transport (work with me here). I'd have fuel pipes, lots of parts indicating storage for tools ect and I've got a thing about aerials, probot style.
Possible uses for the vehicle.
ATAT Support tanker/repair transport
Field Rescue and medical facility
Captain's personal ground vehicle from a Star Destroyer, used to suvey ground operations
Think of it's purpose then add the detail appropriate to it's use!
Hope that's of some help.