Year One (Save >15K)Get back home around August; go back to work two weeks later.Sell the truck and trailer.Start prepping the house for renters.Get a job at Wright-Patterson AFB.Sell all unnecessary furniture and miscellaneous.Vet and sign renters.Move to Dayton, store all the necessary furniture, and rent out a motel at monthly rates.

How do I structure a fair and decent term/s for items like roof and HVAC?

But I would keep records related to a property especially on renovations and items like that. 

An LLC is a pass-through entity meaning it pays no tax at the entity level and all items of income and expenses are picked up on the owners' returns.  

Also, he will likely be going around shopping for furniture, kitchenware and other household items after arriving.

As you get to smaller projects, and missed items tend to be smaller in scale and cost, it can help. 

There would be an itemized report for them to keep things separate.  

Your big box stores will have some in stock, you just have to cut them to size, cut a sink hole in them, and install. 

However; CA is now under stay at home order, and they're talking about Marshall Law, which of course being CA, most think it means it was done to give everyone a jump on summer vacation, and allow them to go to home stores and buy supplies for home improvement projects.

You will get higher rent than typical long term rent, you don’t have to store your furniture, you will be helping health care workers.