Not necessary built better, but they usually had smaller (6 cylinder) motors and shorter beds, making them lighter in the front/heavier in the back. Plus they had locking differentials. So yeah they got around better in 2wd than later model full size trucks did.
I think 1966 was the first long bed Chevy truck. They were standard with a 250 6 cylinder and 3 on the tree transmission (gutless POS). So in 1968 they went completely the other direction and offered big-block 396 and 400 (RAT) V8's in them with 400turbo auto transmissions.....NOW THOSE were fun trucks! 😅
They continued that until 1976. The 1976 Big 10 Chevy's had a 454 big block with a Quad intake..... Freakin' Beast! Not that great off-road, but they were capable of some Impressive Burnouts. 😂
In 1978 they backed off a bit, with the Silverado and old reliable 350 small block from the 1972-73 era.