See if you can get a single. See if there are co-op houses, where you can get a single. Maybe there’s an inexpensive frat that you could join, where you could have a single. Look into nearby off-campus housing.
Sometimes, if you have certain issues that require a single (health issues, mental health issues, etc), you can get an accommodation that you get a single.
I think that living in an RV could be a problem, but if you have a place to park it, and if you can use the school gym to shower, and you have access to toilets, and you can deal with the climate issues, it might be a feasible option.