I was under my Regular cab/short bed and noticed two round (pucks) weights bolted together and mounted to a bracket to the outside of the frame about the middle of the lenght of the truck. They appear to have no function and the question is what the hell are they for?

Probably a body mount. This near a corner of the cab?

If those are what I think they are, they have been asked about before and were said to be vibrating dampeners.

Get some pics and post to be sure

yep. Weed is correct. Frames produce vibrations that turn into harmonics that would otherwise resonate into the cab. They are there to eliminate unwanted noises.

I'm a machinist by trade and that was my first thought, thanks again gents.

Flux capacitor dampers.

I could smell the banana

I guess it depends on where that banana was used it you can smell it......