I would love to have an intercom, and agree noise cancelling is likely the way to go. The reason is things get loud at 75, even with "quiet" tires. I have spent a lot of time around helicopters and lots of other noisy stuff, so hearing protection is important to me.
One of my concerns is are there any legal concerns? I think there may be. You can wear a helmet on a motorcycle and that helps with noise, and you can use an intercom on a motorcycle.
But can you wear headsets in a Jeep?
If they were cheaper, I might already have a set.