3/4 boomer weights 27lbs.......Just because that's what YOU'VE seen used doesn't mean they aren't around or used. 3/4 are around and if you can't lift them by hand, then why is a 5 year old commenting? Because that's about the only person who can't handle them by hand with ease. 3/4 chain weights about 5.4lbs per foot, same thing applies....if you can't handle it by hand somethings wrong.
And as I said, that is the reason I don't use 4, the chains and boomers will hold in a accident, something else will go first. And whether 2 or 4 chains are used, you are attached to the trailer in the same 4 spots.
...................na nuff said already 100-150 lbs of chain, 60 lbs of boomer 10+ times per day add it up it gets really old really fast.