Davit cranes for lifting supplies

I have seen billboards with what looks like a small davit crane bolted to the structure for lifting supplies and equipment. Any idea who sells these?

We are taking offers for purchase of our property.
It has two boards on it. A 10x22 and a junior board.
It has permits held by Fairway outdoor HOWEVER there are no current lessees in effect and can be negotiated by a new owner! -In March we issued them a letter stating the leases will not be renewed.-

The address is:
11304 US-221
Woodruff, SC 29388
Tax map #4-32-00-050.01

Send your Letter of intent to purchase to Christopher@capitalmatters.us