It's very simple. If she thinks it's worth $15000, it's hers. Tell her to give you $7500 and start over.
You could get it back for under $5000, with a little help from your friends.
You know nobody will pay more than that. Then with the $2500 you have left over you can buy more truck stuff.
__________________
Adversity doesn't test your character; it reveals it.
71 C-10 LWB 350/TH350. I purchased it in 1978 for $1400. I'm currently abusing it daily. (when it's running
)