I'm still at a loss to understand why anyone would think a 2200 pound
axle is undersized on a trailer with a
fully loaded axle weight of 1400-1750 pounds*. How much are you planning to cram into such a tiny trailer?
*from the Trailer Weights in the Real World database
The low ride height of a stock
Scamp 13 is an intentional result of the 22.5 degree upward angle of the torsion
axle arms, not a sign that the axle is near its
weight limit. The wheel wells are quite deep, and the design is optimized for a low highway towing profile. We pack our
Scamp fairly heavily for a week's trip with four people, and there is still plenty of room in the wheel wells, plenty of margin on the axle rating, and it rides better loaded than empty.
Changing the axle arm angle would raise the ride height for off-highway use without adding harshness to the ride. What you don't want is an overly firm suspension that transmits every impact to the frame, shell, contents, hitch, tow vehicle,... You may find other lightweight components failing. As you say- the weakest link.
I'll second the suggestion to take this to Paul Neumeister. He is well-acquainted with the construction of these small eggs.