I haven't used the Cabela's, but I have a pair of 20x60 Pentax that I use out of my truck, like on a recent javelina hunt. They work fine, but a little on the big & bulky side. 20x80s would really be big. The 20x60s work good with a tripod and a chair. If I'm away from the truck I use a regular spotting scope.
-- Bob