Yeah, I'm 6'5", and you are telling me the Taco has a leg room problem.
Really? That's what you got?
Second to last GMC I bought we had to drop a rebuilt motor in at 130K because #6 cylinder was shot. Of course, I bought it for only 3K, so it wasn't a significant economic loss. The last one I bought has under 200K on it and the doors won't close, EVERYTHING in the front end suspension is shot to hell, and the transmission is hinkey. Oh, well, I bought it for $500, so it'll do as a feed truck on the farm. The equivalent mileage and age Taco will be worth roughly 50% of it's new value. Yes, it matters. It matters about $15K.
So, I'll give you your pump noise (LOL!!!!!) for a blown GMC engine. Which is why Chevy's drop in value like they do. It's where GM gets that slogan "Like a Rock". That's how they drop in value.
