Can you give some more details on your startup? (Hours you put into it, hourly rate you are earning after several years of working on it)
I'm asking because I know someone who sank about a decade into a startup, and at the end it was making a small net profit. The reality that she finally had to come to terms though with was that even with its "profits" - for the amount of hours she put into it she would have better off getting even a minimum wage job. And she wasn't in a situation where she could afford the luxury of earning less than minimum wage.
I'm hinting that at $13-15k income, you aren't earning enough to support yourself (even if you buy a trailer outright). So something drastically has to change. If the reason you aren't earning more is that you're devoting too much time to a startup to get a traditional job, you might need to evaluate whether that has to be put on hold til you are out of crisis mode.
If on the other hand you're earning more through the startup than you could working for someone else, then it might make sense to carry on.
As far as your direct question goes, once you buy the acre of land, what would be the annual cost of property taxes, water, utilities, yard maintenance, and additional commute expense from living 30 minutes away from town? And how many hours a week would be spent mowing a yard or commuting - and would those hours be better spent earning money at either a job or your startup? I'm not saying it's a bad choice, just saying the way you posed the question sounds like you are seeing it as a one time expense, and I'd like to see the recurring costs figured into the equation.