Aluminum has many advantages, less weight, no rust, no paint just to name a few. They also retain their resale better. They do have to be made and welded correctly tho or they can break up more than a steel. You get what you pay for applies even more to aluminum trailers than steel. An aluminum trailer could certainly be the last one you need to buy unless you want to go bigger. I built these 2 about 15 years ago and they are still going strong.