Originally Posted by DR_

I am sure you could upgrade the axle to 5000 lbs. however most states require brakes on car trailers. I highly recommend electronic trailer brakes and a good brake controller.
Since you are so close to maximum you really need a load distribution hitch.
Single axle trailers sway really badly but with a load distribution hitch and sway control it problably would be managable.
I had a custom 16" 2 axle trailer made as I wanted some pretty specific stuff.
I have divided garage stalls and I wanted to be able to put the trailer in the garage so I had them make it as wide as possible while still fitting, which was 93". Typical car trailers are 102" wide.
I had removable trailer fenders put on both sides.
I had rollers put on the back so it would not bottom out going down my driveway.
I had LED lights put on.
I had 7' ramps instead of the typical 4-6' ramps
The trailer came out to be 1500 lbs which is not much more than the same size aluminum
The price was $2200 which is about half what a comparable aluminum would be.