Should I sell my spare parts truck? Or keep it?

2014 Cascadia with ~800k miles. It's been off the road for a year, sitting behind the garage (driver quit, and i didnt want to deal with having employees anymore). I kept it around because I've been scavenging tires n things off of it as they were going bad on my working 2016 Cascadia, and also because it's got a almost brand new $15,000 OneBox (which I will inevitably need at some point in my working truck). It's been started regularly but not moved.

The bad:
Needs all new drives, steers ain't great either
No bumper
Needs new batteries
Interior pretty beat up ( just dirty and dog hair, nothing gross)
Check engine light about def heaters
City horn stuck on
AC needs recharge
Miscellaneous air leaks

The good:
New ONEBOX!
Engine and 10 speed transmission strong
Has had lower bearings and overhead done
Newish radiator and air pump.

Except for the one box, I've already scavenged just about all I can from it on my own. I ain't doing an engine swap in my yard...

Should I sell, keep, or try to sell without the OneBox (the only thing I care about)? And what would be a fair price (with or without onebox)?

 

I have absolutely no ability to take off things like engine or transmission. The most I can take off is like air pump or door or the one box.

Also I'm on the road a lot and making good money, I'd rather sell the whole thing as a lump sum instead of scrapping it and getting dirty and wasting time when I could be making $1000 a day actually driving and chilling and listening to audiobooks.

Another problem is a lot of those parts ain't doing me any good if I break down on the other side of the country. The one box at least usually fails over time, so I will be able to make it home and replace that...

Somebody is offering me $10k for it as is without the onebox...

 

Brand new cpc is worth $5k. This thing's cpc prolly has mice living in it at this point.

Also, how much are CPCs usually, without the chip shortage? Couple of thousand $?

 

Yeah, seems like a decent deal. Only a couple of years ago you could get a perfectly functional road-ready Columbia for that price.