First off, yes a Ford dealer will service the chassis/power-train on your MH. I would look at the service recommendations in your Ford owners manual for scheduled & preventive maintenance. If you didn't receive an owners manual when you bought your MH you can down load a copy off the Ford website. Unless you received a service history including invoices for service completed in the past I would assume that nothing has been done. Oil changes, replacing fuel filters, transmission flush and fluid changes, gear box fluid changes seem pretty expensive when you have to do them all at once but that is the cheapest insurance you can buy to keep your rig running right. I wouldn't necessarily get that work done at a Ford dealership. Try to find a dependable shop in your area. More than likely you'll get better service at a better price from an independent shop. Take a look at the manufacture date on your tires. If they are original equipment they are getting close to needing to be replaced. Normally 7 years is about max in spite of low mileage or how good they look.
Here's one resource for finding local service but having a recommendation from someone you know is better.
RV Service Reviews
Good luck, and again don't get frugal with the preventive maintenance. It's easy to end up tripping over dollars trying to save nickels.