Thanks to this web site and the kind people who have given the information I have gotten here, I was able to pull the plug and go with my leveling kit and 285/65/R20's.
Here are the specifics - Work was performed by RMT Off Road in Fort Collins, Colorado. I highly recommend them for ANY work you need done. I used them because they were an authorized installer to save my new truck warranty as this truck only has 6,000 miles on it.
Traxda 3"+1" leveling kit - (before tires, I gained 2-3/4" height at the front)
OEM 20" x 9" wheels - No Spacers
285/65/R20 BFG KO2's
Measurements after Level & KO2's
At front license plate - ground to the top of the bumper at body line - 25-3/16" Originally...............Leveled - 29-7/16"
At receiver hitch - 18-13/16" Originally...............Leveled 20-5/16"
At front fender - 36-1/4" Originally..................Leveled 40-1/8"
At back fender - 38-1/2" Originally..................Leveled 41-3/4"
I get very minor rubbing at full lock, only on the driver side. It rubs about a quarter size spot at the rear of the well lining, toward the frame. I will tie this back with a zip tie this spring when the weather is warmer. It is so slight that I can wait until then to do this.
Thanks again to everyone on this site for their input and help.