When my wife and I were short of funds we used two tents (one for use by my wife and I and one for our boy and two sheepdogs. Add in a Coleman cookstove and an insulated cooler and a stainless coffee percolator and we were good to go and we used this setup for 10 years.
Buying a small Burro type trailer and learning how to hook it up and tow it safely and adding all the stuff inside is not all that much easier than pitching a tent and firing up a cookstove and pulling out a couple of lanterns.
Go to the nearest state or national park campground and take a look at what people are using and talk to them about how much they spent to get started.
A separate benefit of tent camping is that you can use any one of the campsites in any campground which is not true with trailers and motorhomes.