Lots of choices still for 16.5's
As mentioned Lynch has the Unicure retreads.
Super Swamper IROK's available in stock size
PJ Dirt Grips in stock size and 38X15.5X16.5
There are some others as well. I currently run the Swampers. Nice tire. Well mannered onroad and great off-road. I ran the 38 PJ's for about 6-9 months. Wonderful offroad. Horrible on suspension
Got my tires from National Tire and Wheel. The Swampers are just under $300/ea. shipped.