You came to the right place. This site is FULL of answers to the very questions that you ask (cheap to free stays of all kinds, eg).
One thing I would add if you are looking to save money is to buy Used. Half retail of a recent trailer sales price would be the ball park for a nice one.
Workamping is another thought since I have no idea how you make your money that want to save.
Also, it depends on the SUV. Factory guidelines for your model should be easy to find. The fellow that bought a trailer from me a few years back(<5000#) had no problem staying within guidelines+safety factor with his SUV. Heck my 1994 2door Blazer was rated to tow it. Just get a good weight distribution setup.
