My CF-54A2900CM is up for sale for $1600 for the unit and $300 for the dock or if you buy both together I'll knock off $100 and sell for $1800.
Less than 3000 hours
16GB RAM Upgraded - $50
500GB M.2 SSD Upgraded - $170 here: https://www.amazon.com/gp/product/B00TG
2nd bay battery (Runs about 8 hours easy with both batteries) Upgraded - $114 is my cost on that
Emissive upgraded - $232
4G LTE Gobi 5000 upgraded - $117
$683 I paid STRAIGHT UP for upgrades which puts the base unit price at $817 combo price/$917. I'm not really willing to sell separate because it's a LOT of work...
The dock is virtually NEW AS WELL. Original box on that guy. $300.
I have one local construction company that I've serviced for about 10 years now that is VERY interested at $1800 for BOTH.