Simple question. Ignoring the infantry bay, can and how does the Tonbo pick up infantry and battle armour with its Lift Hoists? A man per hoist? By the ton? Can it do it at all?
Yes. Practical RL considerations aside, non-mechanized infantry is still cargo; 3 tons of lifting capacity is enough for a full platoon of 28 troopers; 6 tons will lift a motorized platoon of 28 troopers and their vehicles.
How? well, conceptually each trooper could have a strapped fast-release carabiner as part of their standard battle rattle; one uses a hook or loop of some kind to attach to the hoist and his squadmates/platoon mates latch on as well. Motorized platoons mount heavy-duty carabiners on the vehicles and the troopers hook on to these.
While seemingly silly in a RL application, in-universe the rules allow it.