Sorry you have to sell your truck. It's a damn shame when you have to start selling off your possessions to get by.
I know how you feel though and empathize with you. both me and my wife were layed off last year 9 months after we bought our first house and 4 months after having our second child, I was laid off 3 months after her on december 26th, what a christmas present. We held on barely until september of this year and decided that we were going to have to sell our house by January. We got really lucky though, not even two weeks after we had discussed selling our house my wifes old job that laid her off hired her back. Now we are doing ok.
I really hope that things work out for you before you have to sell, anything can happen overnight. Hang in there, and good luck.
And the same to anyone else who is going through some tough times.