alloy canopy strength

Hi, I have this 2.5mm alloy Ute canopy on a dual-cab with horizontal channels C-sections made out of the same material under the roof.

We want to put a foam mattress & 2 people on it (approx. 150kg) while camping. Is it likely to support the weight?

To err on the cautious side, I'm thinking of putting a temporary vertical strut from the tray floor to middle horizontal channel while camping.

Any ideas?

Regards.