When the army changed over from the series III landrover to the 110 the caribou lost any ability to transport a 4x4. The 110 had flared wheel arches and would not physically fit into the back of a caribou so effectivley cutting out of one of its roles. With the 110 about to be replaced by something bigger/heavier the herc may find it in the same boat. And no it probably won't be one of their requirements to fit in the back of a C130 when they have a shiny C-17.
All of the contenders for the light armored 4x4 project are 7-8t (
Contest to replace Land Rovers | The Australian). Upgraded M113s are now 18t - they're due to be replaced within the decade and expect the new AFVs to be heavier at >25t