Even though it seems you are set on a new one, I think you may want to reconsider. We rebuilt our Dometic RM2800 some 10 years ago in an afternoon. It has worked flawlessly ever since. We half-time so that is roughly 5 years of use. I have reasonable tool skills but am not by any means an expert.
If the box, doors, shelves are in good shape, you really aren't gaining anything with new except a new control board (which seem to have a high failure rate).
My 2 cents
new (usually dirty) Nissan Titan XD (hardly paid for)
Middle-aged Safari SE
Young, lovely bride