Are Trailer Parks Zoned for Tiny Houses?

Short answer: No.

Longer answer with reasoning and points of consideration follows.
Trailer parks are zoned for modular housing (MH), which are a form of
industrialized building (IB). Both of these groups are managed by
government oversight for manufacturing. Modular Homes are 400 sf and
larger, which falls under the purview of Housing and Urban
Development (HUD).

Many tiny houses are considered home-built recreational vehicles (RVs),
which are built under a set of industry adopted guidelines that are
largely self-governing by bodies like the Recreational Vehicle Industry
Association (RVIA). The two key documents that drive RV design are the
NFPA 1192 (for standard travel trailers, 8′-6″ or less) and ANSI 119.5,
which is for park model recreational vehicles that are larger than 8′-6″ in
travel mode, and less than 400 sf (otherwise HUD get involved).

The “sticky wicket” for tiny houses is that… well… they’re really none of
the above. As a home-built RV, it wasn’t produced in a certified
manufacturing facility, nor was it under the preview of local building
inspectors as its on wheels. Many tiny houses are built as well as
conventional homes, which far exceed the standards for recreational
vehicles (first word says it all, “Recreation” — not a domicile).

Since modular homes are built to specific minimum standards for size
and safety, there are areas set aside for their use as a residence (e.g.
mobile home community or trailer park). Similarly, RVs are zoned for
recreational use in campgrounds and RV parks. So, some RV parks will
allow a tiny house to park there, but many areas around Richmond
eschew the use of RVs as domiciles (folks called full-timers), and the
codes are written to force folks to keep on rollin’ down the road.

While the prospect of mobility is strong for many tiny house folks; many
say its the uncertainty of long-term employment. Though many tiny
house folks want a home and sense of place that’s more than an RV park
that’s designed to pack ’em in side-by-side for the races. They want a
real community and don’t mind sharing less often used resources (like
washers and dryers), though want a bit more privacy. And, in many
cases, want something that’s made to last, requires fewer resources to
heat and cool, and is less taxing on natural resources like water (and
waste treatment).

The “tiny life” isn’t for everyone, but for many it’s a reasonable solution
to consuming debt and uncertainty that surround our lives. If you can
give up the space, let go of the stuff, and live with people, places, and
things that really matter, it might be time to consider if you too should
take the tiny house plunge.

In any case respect for all in your lives.