Maybe off-topic, but I've heard a lot of drivers, here, locally and on the various feeder Facebook pages complaining about how bad the Kenworths are when backing under a trailer. To be charitable, the acceleration is, um, delayed. Which leads to slamming into the pin of the trailer like you are hoping to have neck surgery.
With the delayed reaction between our foot and the movement of the tractor, the fifth-wheel drags on the lip of the trailer, and our instinct is to give it a little more gas. Too much gas, it turns out, because it takes a little more momentum to lift the trailer up on the fifth-wheel. And when we do that: BAM!
If anyone is interested, or anyone hasn't been shown, our safety committee had a really good demonstration on how to prevent this. I know, I know, who knew the safety committee was good for anything other than some extra OT?
Anyway, what they showed us worked out perfectly. Also, it demonstrated how bad UPS is when it comes to giving us basic, common-sense information on the equipment we use everyday.
Also, I should say this works perfectly when the driver before you sets the legs to the proper height. I promise not to go on a rant about drivers that crank the legs all the way down--you know who you are. Or maybe you morons don---never mind.
What they showed us, was to back up your fifth-wheel a few feet in front of the trailer, then drain the air bags. Wait 10 seconds or so, or however long it takes to empty the bags and lower the rear wheels, then back the fifth-wheel completely under the lip of the trailer, but not far enough to hit the pin. Once you're under the trailer, turn the air back on to the bags. If the trailer is at the right height, you should see the trailer raise up a little bit as the air fills the bags.
Then, all you have to do is just give a little bit of gas in reverse, and the fifth-wheel grabs the pin with a CLICK instead of a BAM! The reason for this is because the plate of the fifth-wheel is already flush with the trailer since the air raised the fifth-wheel up level with the bottom of the trailer instead of having to go down and under the trailer, which stops the tractor until you give it more gas, which causes the lurching that causes in the BAM!
Genius!
Sorry if a lot of you already knew this, and we had this demonstration more than a year ago, but it really works.
Anyway, I just thought I would pass it on.