I also tried to do a trailer after feeling like I was outgrowing my minivan for diving. I made the mistake of using a small trailer. Ended up being a big pain in the butt and I went back to using the van directly. The problems for me were that the amount of stuff I bring leads to the small 4x6 trailer being completely stuffed floor to ceiling. Also, if the weight is not balanced left to right, it will sway dangerously until you pull off the interstate and pull everything out to rearrange. Then you've got a mess because as I mentioned it's all full of stuff and has been moved around one or more times to get the weight load right.
Maybe if I had all aluminum tanks rather than big steel tanks it would be a little better. Maybe it would be better if I didn't combine camping and diving so had less stuff to haul around.
Also, you've got another set of tires to maintain, and security concerns. Trailers are targets for thieves as they're easy to break into and they're easy to steal outright.
Oh and fuel economy, I lose about 10-15mpg when towing the trailer. Any trailer in fact, even open top ones with mesh sides. I don't really understand why that is, but it definitely is.
I did buy a sway bar, which should have helped manage the sway from unbalanced loads some. I have no idea how much because I never got around to installing it.
In the end, I abandoned the trailer and went back to using the minivan. The van also gets packed floor to ceiling, but it's just easier to manage everything and less of a security risk.
That's my opinion, worth what you paid for it. Maybe a bigger trailer would have solved the problem? I went small because the towing capacity on my Honda Odyssey is very small. Someday I'd like to get a fullsize van or even a sprinter type van for diving.
I hope you have a better trailer experience than I did.