Sell my paid off 2012 F150 FX4 to acquire cash???

[Jonathan Jaime Velarde]

Good Afternoon BP,

I own a 2012 F150 FX4 5.0. 

I paid it off last year and currently going back and forth with whether or not I should keep it or sell it for roughly 24-25K, spend a couple grand on a super fuel efficient car, and have roughly 20K to help fund my first investment property? If I don't sell it I'll have about $20K cash next summer and if I do sell it I would probably have around $35-40K cash, while still being debt free. 

I have no debt to my name and I will be moving back to Southern CA once I am out of the military next summer. The truck has 82,000 miles and is in pretty good condition. 

What are your recommendations?