What kind of truck are you looking at, what sort of miles do you drive, and what would you be using it for? Your initial post is vague enough that I don't think you've really thought it through beyond "Want Truck!"
For a "15%" truck, I agree that an older beater-grade truck (early 90s F150, RWD, base cab, some rust) would be perfectly fine - spend a couple grand on it, spend another bit on tools, maintain it yourself, and use it for truck things when you need a truck. Keep the car.
I've got a perfectly good truck (Crew Cab, Long Bed, diesel) that gets used quite regularly as a truck, and rarely for just hauling me around (usually if it's empty, it means I'm on the way to Home Depot for lumber, the local garden store for a yard or two of dirt/mulch/gravel/etc, or something along those lines). But I'm living on 2 acres that hasn't been lived on for many years, so there's an awful lot of work to be done. I also ride an electric bike if it's just me getting myself around, so...
Plus, in the next year or two, we're getting a 5th wheel to do longer traveling and camping (because we enjoy doing that), and you can't tow a 5th wheel out to the middle of nowhere with a Prius (we plan to do multi-week cross country trips on a regular basis once the kid is a bit older).
So, what are you looking at, and what are you planning to use it for?
If your use case is "driving 50 miles a day to work but I want to feel like a man," and you're looking at a new or nearly new truck, yeah, that's sort of silly.
If you're looking at a beater farm truck for occasional use (which doesn't require $10k plus your current car), and it'll be dirty and have a beat up bed? Go for it.
Basically, if your use case doesn't involve a good spray in bed liner and at least a 6' bed, you probably don't need a truck. :)
