Thought I'd share this with you all. I came upon this the other day from the Lower Rio Grande Valley National Wildlife Refuge website...
"For 24 (for a couple) or 32 (for a single) hours a week, the refuge will provide full RV hook up, utilities, propane and washer/ dryer. A minimum three month commitment is required during the winter season (October through December or January through the end of March). Depending on your interest and the opportunities available, volunteer RV pads are available at Falcon State Park or on the Santa Ana National Wildlife Refuge.
If you think you are interested in volunteering for the refuge, please call (956)784-7500 or apply through the www.volunteer.gov/gov."
https://www.fws.gov/refuge/Lower_Rio..._involved.html
Safe and happy travels.