Work Truck 2000 GMC C3500 pickup

Perfect work truck. Not going to win any beauty competitions but runs strong and reliable. Everything works except A/C and radio works but needs speakers. 340,000 miles on truck, 100,000 on engine. This has been an extremely reliable work truck for me. Mechanically always taken care of. 5.7L 350 vortec engine. Does not use any oil or other fluids. I drove it from Austin, Texas a couple weeks ago and zero problems and didn’t need any fluids added. It’s a great strong truck, just not very pretty.