Custom usually means expensive. What price point are these? Most here try to supply good quality affordable housing to our tenants. This does not include berber carpet, mahogany floors, and custom cabinets.
When you start asking $1,200 rent for a mobile home your tenant pool dwindles considerably in most markets. I target being under 20K all in to sell, and even less preferably.
I'm not saying what you're proposing won't work - it's just very uncommon and the market is smaller for that type of buyer. Exceptions are California and Florida. It's not something I would try personally in Texas.