What do you think my water damaged 2011 1500 is worth?

I have a 2011 Sierra 1500 SLE with 220K miles on it that I've cherished since 2013 and I'm just trying to see what this sub thinks I could get for selling it.

I work from home and just had a baby so I didn't use my truck for almost two months. We were either at home or we took my wife's car. In that time the XM radio antenna sprouted a leak and it flooded the driver and passenger floor boards. I only found this out when it was raining one day during work hours and I heard a car horn just blaring outside my house. It ended up being my truck, so in the rain I went out and unhooked the battery. There is almost no doubt to be some electrical issues in the dash and mold in the floor.

What is a realistic price I can get for it now?