Like others, I believe the levelers are worth the cost. I will no longer have a coach without them.While technically levelers do not increase the book value. You will find adding them to the lower cost coach will bring you up to the cost of the higher priced coach. If you are paying install costs, you will not save and may pay more in the end.
Again, as other have said, the dish and solar are iffy. What is sat mfgr & model? Is there a receiver?
How much solar? Are panels clean and in good shape? Is this just panels or a system? What controller? If it has a controller, what is it drawing?