Here are a couple of super popular Michelin tires. Both are LT235/85R16E rated at 3042# maximum load capacity and that’s just about where the similarity ends.
XPS RIB Tread Depth 15/32”
Weight 56#
Overall Diameter 32”
Rim Width Range 6-7”
LTX M/S2 Tread Depth 13.5/32”
Weight 43#
Overall Diameter 31.7”
Rim Width Range 6-7.5”
A tire’s carcass provides it’s maximum load capacity (of course you must have air pressure). Everything else is added for lasting performance and durability. The XPS Rib has an extra steel belt. It has an all steel construction, taller treads, retreadability, and sidewall inserts for protection against curb scrubbing. It’s one tough tire, designed primarily for inner city pick-up and delivery.
Durability does not add strength to a tire.