It's definitely possible. You may consider finding a partner to help. My partner and I sourced (off-market), performed due diligence, lined up financing, and closed on 8 parks while still working a 50 Hr/Week corporate job. I was living in Houston at the time and all our parks were in the Mid-West. Just make the commitment, adopt a "failure is not an option" mindset, and don't plan on doing much else with your weekends over the next 12-24 months.
Today we're running a portfolio of over 2,000 sites in 16 parks and do this full-time with a larger team but when I started there was no option but to make things happen remotely, during nights and weekends. Having a partner that has strengths (and hopefully a little more discretionary time) where I have weaknesses and vice-versa has been key to our effectiveness and efficiency.