We've tried that three times now. It wasn't sufficient. She wants objective ratings in the top category, to go by, on top of our own test driving.
Yeah, I only care about my opinion.
This is an interesting idea, but I'm not sure how that could work. It would basically mean renting the exact car we would plan to buy (which may or may not even be available for rental anywhere) for our next half-dozen long trips. At that rate, though, it would take a few years to test drive a half-dozen cars (and if, as you suggest, we can't go by the ratings, then how do we know which half-dozen cars to do this for?), so that we could compare them and make the best choice.
Well, we usually take 6 months to a year to decide, so not an issue for us. If I'm going to live with a vehicle for years....I've never had a car less than 16 years, and we bought our current family car 23 years ago, a little time to shop is important.
But short of arbitrarily deciding to believe Paul, Joan, and Herb and disbelieving Ron, Alice, and Alan, I don't understand how to explain to my wife how you're suggesting she determine which half-dozen cars to rent for a weekend.