Too often on a special interest forum, such as this one, we start thinking that others (non-RV people) like the same things, that we value. If the OP's house was in a motorhome community, then it would fit in and be seen as an asset, to the people looking for a home in such a place. But with it not being in a motorhome community, it may well be a liability, as many/most buyers are looking for a place that "fits in" to the neighborhood.
We feel we got a great deal, when we bought our current home because it didn't "fit in" due to the way it was set on the lot. All the other homes in our neighborhood were lined up square to the street in front, but our home was built to line up with N-S and E-W on the outers walls. Makes it sit at about a 30° angle to the street. Our real estate agent said he had showed it several times and this placement had been a deal killer for most. We offered $50K less than the asking and the owner accepted our offer. We realize, when we go to sell, we will also have to sell it for less than the surrounding homes that fit into the neighborhood better.
I agree with the OP completely about trying to rent. When we decided to full time it and to rent out our home in western Colorado, a 1891 restored Victorian place, it turned into a major problem. We hired a management firm to oversee it but the renters we got in it, were able to "un-remodel" it in about 6 months time. They did more damage to the place than we collected rent from them. They had signed a "no dog clause" in the rental agreement but kept two shepard sized dogs in the house during the day while they were both at work. The dogs destroyed the carpets, scratched the wood work, peed and pooped all over the house, etc. It would have cost us more to take them to court than we would ever have collected. So we evicted them and put the place up for sale. Had to take a hit on the sale price but the house did fit into the neighborhood so did sale somewhat quickly.
If the OP could find an agent that is also an RV person, it should help. Anywhere it can be advertised, increases the chances that a buyer, looking for such a property, would see the ad. The soft real estate market in this area of Florida seems to be changing as many of the empty properties are being sold. A major problem with the Florida real estate market is that many of the homes were owned as 2nd homes by out of state people or owners that were flipping them. When the recession hit, these owners walked off and a glut of houses hit the market. The population of Florida has started to move upwards with new people moving into the state and they are buying homes. Last population figures I saw showed Florida at less than a million people behind New York, and closing fast. Estimates are that by the census of 2020, or sooner, Florida will move into the number 3 spot behind California and Texas.
But as mentioned above, once a house gets the reputation of not selling, due to whatever reason, usually over priced, the local agents/brokers lose interest in pushing that property. If the OP can find an agent they like and trust, then let the agent help them set the asking price for the home. If the OP can't accept what the agent feels the place will sell for, then the OP may have to just close it up and hit the road. Might be nice to have someplace to go back to for short periods of time, as many full timers seem to own.