As others have said, if you are not overly happy or in love with your truck and the $5k would make a decent difference to your life and debts, then by all means. However, if you enjoy your truck and are not struggling to keep up with the bills, keep the truck and dont complicate things. Pro's and Con's to each, but if you want to upgrade or get a new toy in a little while and dont plan on keeping this one for 8 years then by all means, get it done sooner than later.
Personally, I would not sell my truck for anything under what I could do it over again with another and come out atleast $15,000 ahead. The time, effort and hours I have put into my truck, along with just how perfectly it suits my family and I would make it very difficult to do. I have taken a new outlook on life recently that, as long as I can afford the lifestyle and the things I enjoy to do in life without it negatively effecting my family's life experience, then slow down and enjoy what we have and spend more time enjoying what is already here, even if that means missing out on a few extra bucks now and then to buy things we at the end of the day do not need. Not trying to come off some type of way but we could all use a little El Dorado 21 over a camp fire with our close ones not worrying about money more often, so however you can achieve that while keeping the wife happy.. life is good.