I believe several manufacturers have programs available for MHP owners for cash buys.
With Legacy (Fort Worth & Commerce), MHP owners can buy homes at wholesale cost; however, there are a few requirements. The minimum number of homes that can be bought for cash is 2. The reason behind this is so as not to undercut the independent retailers that we have floorplanning arrangements with.
Regarding install and warranty - the delivery and installation can be coordinated by the factory; however, with an RBI license, it is usually more cost effective for a park owner to coordinate their own freight and install (just ask your park rep if you're concerned about bids you've received or need a few referrals, we're happy to help you).
The warranty in our case begins at the date of delivery. We offer both service requests (where contractors or employees from the factory come service the home) and bill backs (you get a local contractor estimate approved and Legacy reimburses you for the work once completed). In most cases, my clients use bill backs for items that are more straightforward simply because it is more convenient on their end.
If you have any additional questions, feel free to reach out to me at firstname.lastname@example.org. Our homes are also available under the CASH program as well and I have done several park deals for Legacy homes within the CASH framework.