I have 15K to spend on a tow vehicle. I need help!

A lot of people bag on the Ford 6.0. But you can find an 05/06 for cheap and do the required mods. Coolant filter, egr delete, turbo back exhaust, and tuner for about $1,500. I had one and it ran well, better than my current stock Duramax. I only got rid of it cause the prior owner had other abuses, like clogged radiator, cracked then welded wheels, and stuff like that.