While you can use the SBA program (504 or 7a) for certain real estate acquisitions - self storage, hotel and/or RV Park/campground properties (gets tricky), rentals would not work.

Maybe it's a good thing that I cannot find any real operators, or underwriting models for RV/Boat storage facilities. :)Who here actually owns and operates these facilities?

Too few details to answer (Of course this varies county by county, all questions could be answered by reading the (zoning)/building code and/or clarified with a visit to the county planning office).but some clarifications because: lots of things are "tiny homes" but what you describe small houses "on permanent foundations" needs to be clarified , tiny homes could be:-stick built, see below. check your county code/planning dept-stick built cabins/recreational, a specific zoning and potential occupancy/etc restrictions but worth looking into where the zoning allows for it -hud manufactured homes (smaller singlewide perhaps 400sq ft 600sq ft minimum)-non-hud park models (on axles), ansi standards- other "RV's" built on a chassis:  organizations, state agencies, etc - will certify factory built (or sometimes inspected professional built) tiny homes on chassis - to whatever standards ansi, riva, dot/ l&i?

I would send every ugly house someone's way of they send me their ugly mobile home and RV my way. 

I convinced the client to get an RV and rent all 3 out on his primary property.

The Prius leads the pack on Hybrids.Hybrids have more low end torque than standard gasoline motors though.

My follow-on question is how to conduct market research on demand for motorhome/RV/camper rentals.

Turnkey rentals on the mainland don't hit 1% RV anymore so might as well bleed cf in Hawaii. 

In my state, I can pack everything up and store it in storage.

The Casino was packed but not many people shopping around the town or at the beach.