Squeaking and Squealing at low speeds

While at low speeds, say below 15 mph, I am hearing a series of squeaks and squeals that seems to originate from somewhere underneath and towards the driver side of the truck. These noises increase and decrease with frequency corresponding to speed, but are not affected by brake modulation (no noticeable change when braking). They are quite loud at first but begin to fade once speeds increase beyond 20 mph until they are almost unnoticeable. The noises also mostly occur while moving forward. Putting the truck into reverse produces one low pitched squeal right as the truck begins to move, but no further noises afterward, and the squeaks only persist when the truck is moving forward. There is also no accompanying vibration, and other than the noise, the truck seems to operate perfectly normal and smooth.

Thanks for your time!