What's the point of light Inf? No APC, sounds like going back in time.
Is the advantage that they could be deployed with whatever transportation is at hand at any given moment?
JWB, 135lb sounds insane for a ruck. We carried that much only twice. Once after registering and once before checking out of service. 150lb was everything we got for a year that included multiple sets of clothes and personal equipment like gas masks, water bottles etc. Enough to fill one locker to the brim.
Still that didnt make us ultralight infantry. :-D
Having to carry a 120mm mortar added quite a bit of weight. 135lb for another guy and me who carried the base plate. 85lb for the guy with the barrel and then somebody needed to handle the 45lb toolbox and bipod and if it was a special day they added some ammo to that. Normally these weapons would be mounted within our tanks but what would be the fun in that? Every group wanted to be faster than the other 5. Most of us seemed to like the challenge and maybe also because it was a bit different than what the other companies in our battalion had to do.
I bet everybody has a few stories to share where they made it harder than it really had to be and nobody complained or actually even liked it because it was different and cool.