I would tell you that this decision will require a lot of soul searching on your behalf.
We had a 37 foot Georgetown with 3 slide outs and put about 70,000kms on it. I truly enjoyed driving the large vehicle and the living space was close to perfect. When it came time to trade the unit I lost lots of $s because of the mileage. It seems that there are MHs out there that haven't traveled very far and they made mine less desirable.
Having a toad with us there was the freedom for shopping and dining etc.
This is a very large rig with a car behind to get in and out of fuel stops, lunch stops and so on.
You require a large truck repair shop to get even simple things repaired.
We had a hydraulic problem in our own driveway with the jacks down and slides out which rendered us totally immobile until we could convince a hydraulic person to make a house call. (They all want the vehicle to go to them) Finding even an oil change location can be an episode when on a trip and the mileage is up. Trailer parks frown on you doing this sort of thing at the campsite.
We traded that MH for a 38 ft 5th wheel with 3 slide outs and a pickup. This provides much better living area for our needs. Now we do our fueling at the end of a travel day after dropping the trailer at the camp ground.
Anyone can service the tow vehicle and if I have a mechanical problem or want a change I only need to deal the truck. The miles that I will put on the trailer are in no way recorded so that the value won't be affected.
Everyone's situation is different. You need to ask how many miles are you going to travel, how large is your bank balance and what living arrangement best suits your needs.
Best of luck with your decision. I can tell you that it wasn't an easy decision for us to go from the MH to the 5th wheel but I think that was right for us.