My biggest concern in trampling is the stability of the person standing on the body. When more than one person is upright then it is like the ice rink scenario can happen where one person can drag over others. I do agree with multiple points simultaneously being crush is better than just one point. With the muscular tramplers if they have done running with the training opposed to sitting or laying in  machine will have good ability to balance. Lighter person will also be able to balance well but is lighter. The obese person is compromised in balance but can easily be 160 kilograms on their own. With the Pacific Islanders I have been with the weight is evenly spread over their body up to the 160 mark and can be as stable as 70 kilogram European lady. They are also able to apply high pressure by sitting (Kneeling is preference to some) on a person. I have preference of them using their soft flesh at contact point. I am turning towards the "Soft as a folded blanket and heavy as a boulder" when working with a person but still lower a car front wheel on my belly if I have not found a person to squash me.
I personally like long duration where one hour of sitting allows the abdomen to fully squash comfortably.
Multiple points of compression by laying on top using me as a mattress does come with the issue of balancing on me and as the top person gets heavier 185 Kilograms (friend Kim) the weight is greater at their hips and midriff leaving the chest missing out. Top and Tail so the heavier hips are on the chest and the thunder thighs on the head is an option but Kim likes to use Cannabis products to relieve pain in legs. This causes her to pass out and can be up to 7 hours before she can reposition herself. Having  her heavy belly directly pressing my midriff and her heavy hips over my hips forces her belly deeper into my abdominal cavity.
A person who I three times (combined 32 hours) was mattress for weighing 235 kilograms in Hamilton some 400 kilometres away also passed out after self medication for many hours. The back fat over the shoulder blades and thick layer around the ribs gave ample pressure (Kim's hips pressure) but I never found them until advance liver issues had developed and has passed since.
Weight and pressure all over can be achieved many ways.