Im going to build my own trailer for my RXP-X. I will use aluminum but Im not sure which profile is needed.

What do u think about 2,5x2,5x1/6 for the tongue and 3x1,5x1/8 for the rest? The trailer will remind of a Triton. Does anyone know what aluminum profile your trailer got?

My other plans are:
Single Torsion Axle
Aluminum wheels
LED lighting

Please help me with the build and ideas