Oh, I'm sorry, we weren't immediately responding to your query. Typically, responses are not immediate. 24 hours or 2 days will find responses of value.
File the following in FWIW. Most tires hit the wear indicators at 2/32. So, at 10/32, you have roughly 8/32 left before new tires. You have run the tires long enough to remove 5 of the 13/32s, so the tires are about half shot (nearly 40% gone).
At most, the road hazard would be prorated based on the remaining tread.
Now, you install 1 new tire. The other 3 are about half-dead.
Generally, tires need to be replaced in pairs on the same axle at bare minimum. You don't state what truck you have, so I'll assume 4WD. The imbalance in the tire's circumference could wreak havoc with the drive train, specifically the transfer case and diffs.
Good luck with your decision.
I fully understand your choice of a screen name.