I own stick built and manufactured homes (stop calling them 'mobile' homes if they're built after 1976, seriously).
So just be clear on whether you're talking about mobile homes, or manufactured homes, and between manufactured homes in a park (with lot rent and rules, and may be taxed as personal property) and manufactured homes on land that you own and are permanently affixed to the land on a foundation so are taxed as real property.
My manufactured homes are all affixed to land that I own, and so are taxed as real property. I financed the purchase through seller financing. I'm only going to speak to manufactured homes treated as real property on land you own (so not in mobile home parks).
Anyone who says that these kinds of manufactured homes don't appreciate doesn't have a clue what they're talking about. Dave Ramsey says this crap and admits that he's been told by experts that he's wrong, yet he repeats it. I think it's just a false believe that many people have taken on board as fact, but never actually checked.
Here: https://www.urban.org/urban-wi...
Where I live, the housing market is bananas. Most well-priced homes, and especially investment homes, are going first day on the market with multiple offers. Home prices have appreciated 20%+ in the past 12mo, and that INCLUDES manufactured homes on owned land!!
I'm actually in the process of doing a 30yr 75% LTV cash-out refi right now to take advantage of it.
Manufactured homes ARE absolutely durable. People who say otherwise are just wrong. I literally have no idea why they would say this. My homes are in a hurricane zone that has seen numerous Cat 1-3 hurricanes in recent years. No damage to any of the units or others in the neighborhood. Remember: units built after 1976 are built to HUD standards: they're just as strong as stick built homes.
The roofs are no different. The plumbing is no different (with some exceptions). The electrical is no different. They are houses. They appreciate roughly at the same pace as comparable stick built homes.
The PROBLEM with manufactured homes on land you own is FINANCING the damned things AND insuring them. Many lenders are scared off by 'manufactured' even though they're taxed and treated as real property, just like stick-built homes. So you'll just have a harder time finding companies willing to do so. But that's also why you should be willing to do creative financing, including seller financing.
Since financing can (and is) an issue, that makes REFINANCING them just as hard, if not harder. So a BRRRR strategy isn't a great idea. You should be thinking buy and hold with them. All of my manufactured home units are landing in the 1.4-1.8% Rule range, so very cash flow positive, AND they appreciate.