While both of those things require strength they both overwhelmingly require an efficient cardiovascular system and endurance. I was a twiggy distance runner in school but I could out work a lot of people who would kick my ass in the gym. When you are humping shingles up a ladder your higher squat record doesn't mean much after your second trip up the ladder.
I worked briefly for FedEx loading trucks after school. The guy doing the hiring said he liked hiring runners and wrestlers. Big football players seemed like a good idea but he said most of them would be gassed and walk out halfway through a 5 hour shift.
If you have to hussle dragging the extra weight around is a handicap if you have to bust ass for more than a quick burst. I had pretty good cardiovascular endurance for someone my size. 6 foot even 220-230. You may laugh but I could run a mile in 6:00 and 3 miles in just under 20:00, at the time very good for someone my size. I wasn't naturally big it all came from lifting, someone like me needed to have balance as if you do too much cardio you can't get or keep the muscle on. I ran 3 miles 6 times a weak and did wind sprints.
If it wasn't for pride and determination I would have quit on the hay chucking and logging at the 5 hour mark like the package humpers did. I did some truck unloading also. It was mostly heavy stuff where you didn't move fast, so I was ok there.