I don't think I've regretted getting rid of vehicles. I get rid of them for definate reasons. In this case I wonder if you would--if you got rid of this one now and went SUV shopping at a later date, would you be willing to take the gamble on a vehicle with little/no known history? What you have you know quite well.
I've toyed with selling my truck for the same reasons, get rid of both vehicle loans. But then I'd be w/o a truck and stuck with a beater as my only driver. And w/o something to pull my camper. So I'd wind up having to find a replacement, and buying a beater truck to travel long distances and/or having to take two vehicles to go on vacation... No go there. So since I suspect I would regret selling it, and since it seems I can "afford" it, it stays.
Still, in this case it would seem you have three vehicles, beater/daily driver, fast car, and a big SUV. If it was me, and it's not! I'd be tempted to sell the supercharged 'Vette, as I'd think that would cost more per mile than the SUV and might bring in more cash than the SUV sale. Might be vastly more fun to drive, but if I was concerned about money I'd ditch the things that cost me more yet have less utility.