There may be some issues.
Guy at Polaris built my double=tube arch out of 6061, sized to be large enough that a diver could pass through from the transom without resorting to gymnastics. The tube itself is 2", about 1/4" wall.
What happened is that the span is large enough that the top oscillates while trailering (doesn't seem to happen on the water to much of a degree), and the rear legs, which are straight for a short distance before bolting to the transom, weakened and broke. I had a friend sleeve and weld them with aluminum, and they broke again above the sleeves.
Currently, I have the unsleeved portion built up with tape, and the resulting mess clamshelled with ABS pipe and hose clamps. In the past, oh, year or so, there have been no further issues, so no further action has been taken. A friend of mine who routinely follows me says the oscillations have been greatly reduced.
Make sure you use a good anti-corrosion treatment that is rated for aluminum on any stainless fastener touching the aluminum, and the use of nylon washers to isolate the bolt heads would probably be a good idea.
In my case, it's the largish span that causes the breakage issue; the resulting structure is harmonic to the road vibration. With the same tubing, and a normal size frame, you probably would not see anything like this.