Need to sell 2015 T-680, know nothing about Trucks/Trucking

Truck is located in the Denver metro area. It was purchased used for $98k in May 2016. Since then there has been less than 10k additional miles put on it (it has around 230k total now). I'm hoping to recoup as much of the sale price as possible.

I've reached out to the dealer we bought it from and I think they are going to offer something around the $80-$82k range. I'm trying to find a way to sell it closer to the $98k that we paid for it. I'm working on getting a spec sheet.

 

I appreciate the concern. Luckily, I have some sale documents from when it was purchased less than a year ago. So I know about how much I should be getting for it. I'm very wary of the bamboozles.