2004 Chevy 2500 bale bed

2004 Chevy with 8.1 liter gas engine and Allison transmission. Just got went through and has a lot of new front end parts and a new radiator. Runs good and the bed works as it should. Engine driven bed with toggles in the cab. The cake feeder can be sold with the pickup if interested in it. Its not gonna win a beauty contest but mechanically it is sound would trust it to drive anywhere. Check engine light is for the o2 sensor. 155k miles and just got done servicing the front and rear end the tranny and transfer case and an oil change with new air filter. She is ready to feed cows.