Upper and Lower Fifth Wheel

Lots of different names.but it's this simple. Upper has the kingpin(trailer). Lower has the jaws(tractor). No gaps between these.

 

Sounds like you have a better understanding than those that write the test. Lol. Should read no gap between the Fifth wheel top plate, and the Trailer King pin apron. Or something like that anyways.Just make sure you don’t try to hook a Trailer that’s too high. Next thing you know, you jump the kingpin over the fifth wheel. Then it’s stuck in front of the fifth wheel. You’ll have to crank the Trailer up high enough to get out of it. Usually something you only do once. Lol. Make sure you’re actually picking the Trailer up, as your backing under it. Get out and check if needed. Raise the landing gear a little, if needed. Just thought I’d mention all that, in case they ask you questions about it. Good Luck. No such thing as a Dumb question.

 

There are no stupid questions.. this is the bottom of the trailer and the fifth wheel. Where the arrow points is where they want you to be sure there is no gap.

 

Learn something every day. Never thought much about it. Trailer apron is the upper plate. Good info.