Save on camping fees. 
A typical powered campsite for 2 adults is $30/night. Staying in a campground once a month for 2 nights could cost around $700/year (most people with a mobile home spend more time away than this). 
If a solar power system costs $2000 it will pay for itself in less than 3 years.
And, the even better news is that you've made a great investment over the long-term. Solar panels come with a 25 year warranty so just imagine the savings !