Because it’s just fine.
Think about it. Do a moment diagram or think of a teeter totter.
You put a fat dude on one end at the very end and you put a 5 year old opposite side, 1’ back from the pivot point, even though that little kid is doing all he can, he ain’t gonna move the fat guy. Not even close
in this case, the teeter totter is your truck and the rear axle is the pivot.
the fat guy is your 1000lb diesel and cab and passengers and heavy front axle. And the 5 year old is the leeetle bit of weight that is on the other side of the pivot when the cog is behind the axle.
it ain’t gonna move the fat guy.
now if the fat guy was a skinny dude (half ton with a half aluminum engine) and the 5 year old was really a teenager, that teenage would come a lot closer to moving the skinny guy.
as long as you have a fat dude and a 5 year old, you’re good.