I assume you have a 7' garage door header? That is common for a 7' garage door. You will lose an inch or two with your garage door, depending on the door. And let's say you have your garage door header and sides bucked out. Usually it is bucked with a 1x6 or 1x8, plus the weather stripping trim. Could be bucked out with a 2x6 or 2x8, plus weather stripping. But none of that should be what prevents a 79.5" truck from clearing, it will be the how well the garage door pulls back and tucks up at the top.
I have never had a truck that didn't clear a 7' garage door opening. I had my 2014 Sierra Z71 with a 6.5 BDS lift on 35" tires. It was close, but it cleared. I can't remember the height of the top of that truck (I did measure it but can't remember), but again, that truck cleared.
Obviously take it real slow when you pull in the first time and put your head out of the window to watch. If you have an old garage door that for some reason doesn't tuck up as high as normal ones, you should be fine.
BTW, where in NE are you? I don't live in NE anymore, been in Montana for 22 years, but northeast NE is where I grew up.