We actually aren't that far off... I like old tech, when it breaks I still have an idea what is wrong. I just had a lot of metal fatigue. Not rust, metal fatigue. The truck was an old CP railroad truck used for service. It bounced along the rails a lot I guess. While it was a good ol truck, it's weight cut into the payload. I don't know how they do the new high strength steel alloys but to have a 2014 F150 with the payload package have a 3000 rated payload from the factory is well, surprising. My 77 gmc 3500 didn't have 2000. My brakes would fade, new or not. My miserable 3 speed auto had virtually no compression braking, and the 77 motor didn't have much compression period. 8.5 I think. I believe my s block 400 had under 210 hp and not much more torque. The newer trucks absolutely spank the old stuff. Now I don't ever think the new ones should be trying to crest passes with trailers behind them at 65-70 but my 30-35 was, well, slow. Even semis passed me. I will say it didn't let me down, the broken springs were caught by the annual inspection at the shop and I didn't get blown around by winds. At nearly 8000 lbs on the road, not much could blow it around.
All I'm saying is that I couldn't safely carry or stop a 10.5 or 11 foot camper, much less one with multiple slides.