RV parks/campgrounds would be the most common choice, with Walmart, etc. parking lots reserved only for single nights while in transit where permitted. With "trailer parks", I'm thinking of those parks built specifically for manufactured homes that seldom if ever relocate. There are a few of those that offer a few RV parking spots, but most don't. The most economical stays at RV parks/campgrounds are usually their weekly and monthly rates when offered. There are both private and public RV parks/campgrounds, with most of the public local, state, and federal parks having maximum stay limits of usually 14 days. Some allow longer stays during light usage periods.