Lisa,

First of all, welcome to the RV Dreams forums.  You will find this to be a good source of information, so feel free to ask about the RV's and the RV'ing lifestyle.

As for using your quilting machine (I'm presuming that you mean quilting), I don't know what kind of business you would get in RV parks as interested customers might be planning to leave prior to your finishing their quilt.  On the other hand, if you were attending craft shows or flea markets, you might find a market in those areas.  Then, with that as a more stable business, the selling to park occupants might work out for you.

Good luck with your planning and research.  Oh, and incidentally, I'm speculating as to the possibilities of you working with  the craft shows and flea markets.  I have no idea if that is an interest for you or not, nor whether the market is actually there.  There are others here on the forums that do deal with some of those venues, so they may be able to give you a better idea of the markets.

Considering the expense of many of the sewing and embroidery machines these days, I highly recommend that your RV definitely have a good system for electrical protection such as the Progressive Industries products.  Neither high or low voltage sources are good for those machines.

Terry