I saw somewhere (on here maybe?) that it’s a better idea, finances permitting, that you hire the car you have on your shortlist for a couple of days. Which means you get to have the car itself for a couple of days and you truly know whether or not it’s suitable.
Problem is getting the actual car you booked along with the spec you’d like. Not sure if it’s viable but I’d rather spend the money on doing that rather than a test drive for 30 minutes.