Trailex is the best and have been around the longest. I would never get anything else. Most folks with bad backs definitely need to go that way.
I do have some steel trailer, but that was because they came with a boat of some kind.
The neat thing about Trailex is that it is made like an Erector Set from the old days. If a part breaks, just buy the part and it bolts right back on. I broke a cross beam by hitting a rock. Called the factory and a few days later I bolted on a new one and was off and running.
They are more expensive than steel, but by far better.
For the Wave you wouldn't need an expensive model, however, so ought to be a pretty good price. Another bonus is you will save money on gas -- much easier to trail a light load than a heavy one.
Hope you will make it to some Wave Regattas, i.e., Wave North Americans at Put-in-Bay, Ohio, and the Nationals in Key Largo, FL.
Good luck,
Rick