Can you cruise at 80+mph in your truck?

[y5mgisi]

Last weekend I drove from Portland to Phoenix and back. I took my '12 gmc. It was comfortable and easy to cruise at 80mph+ for hours on end. After a while I thought, I have never owned a solid axle truck that I would ever want to cruise over about 70mph. Tops. So I was curious, can you comfortably cruise at 80mph or better in your truck for hours on end?*

The reason I ask is I have great visions of taking the burb and the 78 on lengthy road trips. But as it is, that drive wouldn't have been fun in either of those trucks. So I'm wondering if I'm spinning my wheels trying to get something to do a job that it simply can't do, and if I need to be looking in a different direction. Particularly an ifs direction.