2008 Ford F350, 6.4L diesel truck

Bought it 3 years ago just to haul cattle and only put 11,000 kms on it. I am the third owner. Previous owner put in a remand motor around mid 200,000 lms, and had it bullet proofed deleted and tuned by walls. Its reliable and in great shape for its age  and mileage. Has some chips and minor rust. It should have the box replaced, it has a rust hole in the back bottom corner behind rear wheel. Has rails for gooseneck or fifth wheel. Windshield has 2 chips  no cracks. I have put in $5000 over the last 3 years to make sure it was reliable, truck has lots of power. Cruise control isnt working. It needs a new switch that installs on the master cylinder. Vent dam door for heat is stuck one way on the drivers side, but only heat on driver's side. Fuel gauge goes off and on some times. I have receipts for the work i have done.