1. It would help if you had a more positive attitude. Go into it saying "we can do this"! There are an estimated 2 million full-timers out there so it does work. :)
2. If you're trying it out for 3m at a time, our recommendation would be to move around to different parks and types of parks to see what works for you. Sitting for 3m in one place that you dislike would not be any fun. Even move from state to state for a 3-month period.
3. Full-timers manage to live in many types and sizes of RVs. We've met some in just a van. One only had the requirement of the hubby installing a bidet in it! He did!! We saw it.
4. Having outside interests helps a lot and even interests away from each other. Sometimes you just need breathing room. You don't have to do everything together.
5. Volunteering is a great outlet. We did a lot of it from campground hosting to giving lighthouse tours. It gives you purpose, something to do, and usually gives you a free campsite.
6. Yes, you can do it on $3,000/month. Keep track of what you spend per month now. Your lifestyle won't be any different. We were never interested in big city stuff, museums or amusement parks. We enjoyed public parks - national, state, national forests, etc. That saved us a lot of money. It just depends on how you want to spend your time.
7. Think positive!!!! :)
