I not only tried most of the Rav4 size vehicles, but made a spreadsheet based on factory specs! I didn't try any luxury brands, not what I was looking for. The Rav4 was larger than all of them with the exception of the CR-V, which had a little more cargo space - like a cubic foot. The new CR-V had gotten slightly bigger in the passenger area, but has actually given up a very small amount of cargo space. Still looks like there the largest though, probably their target.I did not drive this RAV4. But Grand Highlander is very cramped compared to others in that class, especially Atlas. The third row and trunk are comparable. 1st and 2nd row? Class lower in size.
Sequoia is similar compared to other SUVs in that class, especially the trunk and third row.
I think there is a trend here.
Interestingly the GM whatever they call it had more space in the front - IIRC - but you probably couldn't drive a tent stake between the front and back seats.
Remember these vehicles still start around $30K. There cheap cars for the masses. All of the vehicles in the intermediate CUV class are small.