What are these switches for?

They are after market. I have a clone of one of those on my truck. It lifts my tag axle on the trailer.

 

Google,trailer air suspension dump switches.If you have a spread axle flatbed,you can dump the air on either axle when making a tight turn,helps you turn easier.

 

Those switches are basically just an auxiliary power switch and are used for various things
Lift or dump axles and such
It’s just going to be hot power and if you wanted to you could use them to run extra lights on the trailer or whatever you want that needs power

 

Another term for lift axle or pusher.

 

Shouldn't those be explained in the owners manual?

 

Does your truck have an onboard potty? Perhaps youre supposed to "deliver" potty stuff incognito.

 

The way I was taught to remember the difference is this:
A pusher is mounted in front of the drives/tandems and is pushed by them, a tag axle is mounted behind them and tags along after them.

 

Ayup though its regional for nameing. Where i learned the saying is tag was a catchall term for a drop axle because it could tag along with the fixed axles or not. Pushers alway pushed off the truck and a drag axle was on the trailer (the ACTUAL saying is not at all PC but the words trap and rear entrance should give you an idea lol)