If you want to think I was talking about gunners, feel free.
What I was actually thinking about is that most occupations these days are replacing muscles with motor power. Farmers don't chuck 50lb hay bales any more. 50 lb bags of sugar and salt and flour, 10 gallon cans of milk. All replaced with bulk handling systems. And where movement of small packages is required in the field then small forklifts and cranes are the order of the day.
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Or you can do like the Swedes did with their 155mm limber truck and add lifting aids
By and large the world has moved on and established lifting maximums in the 35 to 50 lb range. Some places the max is a low as 25 lb. That way manufacturers can find people fit and able to do the jobs necessary and keep them on the payroll without unnecessary injury for very long careers.
If the country is offering me nothing but couch potatoes to employ then I have to figure out how to get the job done with couch potatoes.
PS.
I haven't been allowed to build a plant that produced packages weighing more than 50lbs for over 20 years without mechanical handling.
PPS if your three man crew can't get the necessary maintenance done, with appropriate crew rest in 24 hours out of the line then you had better budget for 48 hours.