When my parents did the tow-the-trailer-to-Florida-for-the-winter thing, they got together with a square dance club made up exclusively of RVers and trailer-ers. There's more than one such club... and I'm sure they'd appreciate some live music to dance to! Contact: National Square Dance Campers Association INC., 612 Meadow Lane, PO Box 681, Beecher, Illinois 60401-0681 Phone: (708) 946-6102

There are square dance campgrounds as well; check 'em out and see if they'll book a square-dance-music band! Here's one to start: http://missoula.bigsky.net/sqrdance/

Find more on Google.com; I used the keywords "square dance RV club".