Newbie question - help identify what's under my truck

Hi all,

Picked up my 07 DCSB - Prerunner Friday - previous owner had installed bilsteins (5100's I'm guessing) and the truck is sitting level.

My problem is either the front end is too stiff, or the rear end is too soft. Just seems a little unsettled over rough road.

I was wondering how I can tell if anything is changed under the rear end, and if he did UCA's, and if there might be a slightly softer front spring that might take a bit of the harshness out?

Leafs are a little squeaky too - add some moly grease to the pivot bolts?

 

Check the spare tire mount. They squeak some.