When to and when not to use 4 wheel drive high

Thanks guys I will take a look at the manual in the 89 before I leave for town today and do what it says. I just bought this truck yesterday the 08 colorado is in the body shop was hauling a trailer on sunday and the trailer hit ice behind me went sideways spun us around put us in the ditch and rolled the truck on its side.

Everyone was ok luckily and I don’t know if I was in 4wd or 2wd, the 2 vehicles that were behind me both said the trailer went out behind me and took me with it so I assume it was nothing I did, just a fluke was doing around 50 in a 65 when it happened probably could have been driving slower but was already getting passed every 30 seconds by people doing 70 which tends to excite me a bit more than I would like in those conditions.

Bought the 89 because I was paying 65 dollars a day plus 30% tax on a rental so figured buying it for 1500 was a bit better deal.