I'm a single female, I've been fulltiming in my little old RV for almost 3 years now and I LOVE IT!
I write very day on my blog, mostly about my RV lifestyle.
I have not joined any groups or clubs for singles or women. I tried to meet up with a group of singles at a park, but somehow missed them, they were gone all day on pre-planned outings and I came to the park to soak up the beauty, so I never did get to meet them.
True... you do mostly run into couples and families in the parks and campgrounds, but there are singles both male and female in their RV's both part time and fulltime.
I get along with folks young and old, single and married, so it's not a big issue with me. I bought an RV that had a spare bunk so a single friend can join me and I've had several travel with me a week or two here and there. I would love to meet someone that wanted to travel with me fulltime, but in the interim, I just keep traveling on my own and having an absolute blast!
I picked up a hitchhiker who has been with me over 2 years, a little canine fellow who provides wonderful security and an excuse to go walking several times a day. We stop at dog parks when we can find them and meet lots of nice folks there as well as the campgrounds.
I've made some RV friends and we try to rendezvous in parks together from time to time.
It's a fun life and I love it!