2005 Silverado 4x4 "Work" Truck

I bought this truck 7 years ago when it had 160K miles on it. It now has 177K. It's been a great truck. Only used to pull my 14ft. fishing boat up to Big Marine Lake about 6 times per summer, otherwise it's been used for a couple camping trips but very little else. PROS: 295 hp @ 5,200 rpm 5.3 Ltr VORTEC Engine, burns NO oil, nor does it leak, anywhere. 4x4 New Cooper Tires and new Rims at 170K All New Brakes in 2018, and New Brake Lines in 2022! Topper in Excellent Shape Interior still in great shape. No rips, No tears. Terrific Pioneer Stereo - With Bluetooth Only 177k miles, which on this truck is broken in nicely. Engine runs quietly. CONS: Pinion gear seems to pull a little hard to the left turn, but it has done so since I bought it and has not gotten any worse. It is barely noticeable. It steers just fine, straight and true. A/C has a leak. Fill it up and it works perfect for a couple days, but then loses all the coolant. Typical Chevy Rust on the Quarter Panels. Not bad up front, not leaking into the compartment. (See Pics) I left the driver's side window open during a storm once and ever since the Air Bag warning light has been on steady. (Sorry, but I just got home from fishing and didn't have time to empty the back end yet) I am selling because I just can't climb in and out of it anymore due to several back surgeries. I got a small Van instead. Asking $3500, and I will accept NO Low-Ball offers. Heck, the Topper is worth $500 all by itself, the tires even more. (This truck has started in the coldest depths of winter, every year.) Many Thanks.