First, much love to your family. My best wishes and thoughts are with you all.
Second, that kind of use is harder on the rig, but you shouldn't be able to tell a terrible difference. Little things will get worked harder- drawer slides, door hinges, drawers themselves. My kids are much rougher on the camper than my wife and I. But really, from that perspective- I spent $100 on new drawer slides and a few hours of my and my father-in-law's time.
The other thing that could happen is random water leaks. The camper not being moved should help minimize that. But basically have them be diligent in addressing any sightes of unexpected water. If it shows up, make sure someone takes a look ASAP. I've dealt with 4 or 5 water leaks now. One was a real PITA (the one-way check valve at the back of the water heater).
If they're not RVers, you/they may have a gray or blank tank surprise. Make sure they're not leaving the black tank open and do make sure they try to take time to flush the tanks.
Make sure someone (you or a mobile tech?) checks out the roof and seals sometime in October. Just as a precaution.
Actual systems have been working great for us fulltiming for almost 15 months now. Little quirks show up- for instance, my electric side of the water heater has decided to go kaput.
This is a wonderful thing that you can give them close by accommodations.
Again, good thoughts/juju/and well wishes to the baby and your whole family.