From a buyers perspective, if i can go down to the dealer and pay $25k, im not going to pay $22.5k for your used machine. New equipment loans have much better terms than used equipment loans too. So, i would expect to take atleast a 20% hair cut.
With that, if yours has a lot of options, buyers are likely comparing your asking, vs a base model; so, I dont think your "linked pedel" or other upgrades will count much for you. Rear remotes, maybe a bit, but at best, 20% off base, and about 50% off impliments/upgrades/options.