Thank you "fvstringpicker" for the Bowman's Lake info.
I have seen other websites that report problems with narrow road. I conclude that an 8' wide travel trailer just isn't going to make it without getting scratched up pretty bad. The narrow road might even tear off the automatic roll-up awning.
My primary plan will be to travel trailer camp at the Apgar campground and leave the travel trailer there while I take the truck for a day trip to Bowman's Lake, 33 miles away.