This is the container I built from for my project mentioned in another Comment, apologies for blowing up your notifications I'm just tracking down all the authors!

Hmm, good point. Testing was done in vanilla survival with realistic settings in 1.1G. I'll see what I can do to buff it up for other settings. A second parachute should go a long ways.

Only one parachute for 2 medium cargo containers? That won't be able to drop much mass. Keep in mind a single medium container can hold around 22000kg of components or 70000kg of ingots. A single parachute will barely provide enough drag for a safe landing at 7.5-10 kg, and your modular container already weighs 4,370kg unloaded.