the bad thing about Aluminum frames is unless they are re-heat treated they will crack over time on washboard roads and other rough conditions.
Our trailers are not that bad on weight, I would rather have something that is a bit over built and will last, then under built.
We pull our full loaded trailer with our jk running 37's with no issues.
I like your trailers, but sorry, I don't buy the "under built" comment just because Aluminum is used.
"Under-engineered" may be more common with shop-built stuff, and Aluminum may be harder to engineer well, but I don't buy "under built" at all with Aluminum. Heck - I'm getting on an Aluminum airplane tomorrow!
I just sold our 30 year family General Aviation business 2 years ago, so I know the aviation business very well.
I'm not saying Aluminum trailer is under built.
Just saying a all aluminum trailer, including the frame that will be strong for many years will not be 50% lighter then a steel trailer. Lighter yes, just remember Aluminium construction that is built properly with cost 25% more then steel to build it right.....we have been looking into it.
I had a aluminum trailer I used for a short time. It was a 4x6 with 16" high sides. The trailer did not pull well at all. Using a 2500lb axle it bounced all over the road empty and you had to keep some weight on the tongue to keep it from swaying. When I built mine I was torn between aluminum and steel. After using the Aluminum one for a few weeks I went with steel.
If you have a power problem I would address that. Gears, programmers etc IMHO would be the way to go.