One thing I can add. Diesel MHs come with Automatic Generator Start more often than Gas MHs. Not all do, but more than gas. If you are taking the doggies, this may be important to you. If you leave them, you will not have to worry about the power being cut out. Your generator will fire up automatically if you have this system.
AGS can be installed on most rigs for less than $1,000, so not a big deal but better to know up front while shopping.
Part of shopping will be comparing the price of purchase and the costs of immediate needs after purchase. Like already mentioned, the tires can be big bucks.