@Madeline Davies this sounds like a bit high-difficulty for a first deal, but I could be wrong.
It is not our core business, but we have installed new manufactured homes on vacant land (for outright sale) and in mobile home parks (for rental; we are not the park owners), and each state has its own degree of regulation. To vastly over-simplify, manufactured homes are regulated by HUD (administered by HUD or the state), mobile homes are locally regulated (town/city code office). But zoning still applies - the local code officer in NY has to sign off on the foundation or piers, but doesn't deal with the manufactured home itself.
If NV requires licensed/registered installers (NY does), you might reach out to a couple and see what they think about your plan. In NY state, we also needed to register our company and I took required training to qualify as a manufactured home retailer, even though we are selling the home & the land together as real property (not personal property).
Manufactured homes are an interesting niche, so I don't want to tell you not to focus here, but the whole move-a-home-during-escrow sounds like a risky proposition (what happens if you don't get approved? Will the seller let you move the home back off their land at that point? And then where do you park the units?). But if you can work out the details, could be a great deal...