I would like information on this issues as well, was told the mobile homes couldn't have been moved since purchased and put in place, must be a double wide. 

The costs can vary widely depending upon the end user.

As others have told you, 17" toilets are widely available for $100, and if your plumber or handyman wants more than $150-200 to install it, get a new plumber.

I believe it is a little overkill to have cable since all of the popular streaming services have a wide variety for people to choose from.

Incase you didn't know this already buying a turnkey new home is not in the equation for me :) FYI this is me looking at the wide lens view, I need more clarity on your intentions to give a more specific answer.

Wide open to any suggestions on how or what the smartest move for acquiring this land and 4 structures looks like.

Myrtle Beach is great fundamentally for a host of reasons including 20M+ visitors per year, a ton of long-term residential growth, and a wide range of properties to choose from (condos, condotels, SFH) but you need to make sure you are looking in the right condo complexes, right zoning and investing into the property itself to stand out from the crowd. 

The way property taxes are assessed varies widely by state and even between neighboring counties.

Very nice 900 sqft single-wide trailer on .15 acres that also has a STR permit that is transferable to the new owner.

I have a spreadsheet that has columns for everything.....BRs, baths, Finished basement, finished attic, granite or formica countertops, hardwood or laminate, vinyl siding or aluminum siding, two-car wide driveway vs single wide, etc, etc.