Some overkill here, but a little clarification I hope.
We live in a stickbuilt home... built from the ground up... foundation, and flooors, walls and ceiling all put together on site... piece by piece.
My best friend has a modular home that was prefabricated in pieces... Walls with electricity and wiring built in, as well as doors and windows. The pieces were transported on flatbed trailers, and erected and put together on a concrete cellar foundation.
We own a Park Model Trailer... essentially what most people think of as a Mobile Home, as in what most people understand as trailer parks. The Park Model Trailer, is brought to the site on wheels, which ususally stay under the trailer as it is skirted. "Park" models are just that ... designed to be in Parks and Campgrounds... limited in size, and although they are not commonly moved, the wheels are there so that for whatever reason... the Park or Campground owner can reclaim the site, without having an expensive clean up fee. A park model trailer has size limits... 400 S.F. commonly 12 ft wide and 34 ft long. In our Campground, the maximum size of buildings is 400SF for the main building, 400SF for an add-a-room, 400SF for a deck, and two 8X12 storage sheds. Newer models have log siding, and or higher roofs, accomodating sleeping lofts. the construction is typically 2"x3"'s and the siding is either metal or vinyl. The building is constructed on a steel trailer frame. Roofs may be shingled, aluminum sheeting (as ours is) or metal. Almost all Park models are sold complete, with full kitchens and appliances, main propane heating, and airconditioning, as well as full, (if small) bathrooms, and bedrooms with beds and dressers etc. Most park models are somewhat different from travel trailers or motoromes, in that there are few multiple use constructs as slideout beds, tables etc.
We also have a mobile home (not motorhome) in a mobile home community. Our home is older (1988) when the standard width for a mobile home was 14 feet. Ours is 14ft x 67ft and we have a double wide car port, an attached storage shed and a glassed in sunroom 14ft X 12ft. Sometime in the late 1980's, rules for mobile homes changed, first to allowing "sections" that were 15ft wide, and now, to "sections" that are as wide as 16ft. Today you can buy these "mobile homes" in various configuations, as double wides, triple wides and more. The sections come prebuilt, and are assembled on site, by bolting together, rolling out carpeting or flooring, and "crowning" the roof sections. Usually a 1 day process.
First impressions of mobile homes, the older 14ft wide may have seemed somewhat confining, with the lengthwide layout. Newer double and triple wide models often have vaulted ceilings, and greatrooms that might be 20ftX30ft.
One of the fears that many have about mobile homes, is the history of total damages caused by hurricanes or tornadoes. Laws were enacted in Florida and other states in the late 90's that required deep tiedowns, and modular construction that relied on steel banding around the core areas of the building sections. This is still a work in progress, given the millions of homes built before these laws. Retrofitting of tie downs was partially funded by the State of Florida for older homes.
As to where to settle... Of course most prefab or mobiles can be placed anywhere the laws allow this type of habitation. Personally, I feel very strongly about mobile home parks/communities... especially those with age restrictions. I must admit, that at one time, I would not have wanted to live next to seniors... especially in close proximity, as on a smaller sized lot. Now, it is more like heaven... quiet, no kids, all yards and lawns kept neat as a pin... a three minute walk to the swimming pool, the clubhouse, pool tables, hot tub... and especially the parties at the clubhouse. Friends with everyone... any and all projects have dozens of volunteers, AM coffee in the clubhouse, classes, lectures, cards, shows, potlucks, and action not quite 24/7, but at least 14/7. Next door to a nature preserve, 50 minutes from Disney... Our park's clubhouse/pool and sport complex is on the major lake of a chain of lakes with a 512 mile shoreline, and we have a 52 slip marina, mostly pontoon boats.
As mentioned in some other posts, many Parks, including ours have increased lot rents. We're grandfathered in with an annual rent of about $4500, which would now be about $6200/yr and an annual increase of $5mo. so that is a consideration. The good part of that, is we don't have to pay to a reserve, for repairs, roads, roof's, pool costs etc. Renting/Owning a tossup as far as I can see.
We had a chance to buy our park from the original owners at one time, but the shift of cost and responsibility to the residents made it a no brainer.
So much for MFG homes... IMHO, the home is superfluous... you can spend any amount, from $20K to a million dollars, but the fullness of life in the later years comes from family or community... The family is busy, doing their thing... the community is busy, doing my/our thing.