How are the bikes packed?
In short, it’s not easy if they’re in bulky bike bags. We’ve done this as a couple of times as a couple, 2 bikes in bike bags and some other luggage.
We rented SUVs and ended up with a Nissan Xterra once and a Ford Explorer another time, which are both 7 seaters. We got everything in with all the seats down, but I wouldn’t say there was masses of space left over. That said, I’m fussy about being able to see out the back/sides, if you’re not, then you might be able to get the bikes bags in vertically. Regardless, I’m pretty sure our bike bags were too long to fit in with the rear seats up.
It’s worth saying the bigger is not always better. Seeing that we had some bulky kit, the agent suggested a Tahoe, which is vast on the outside, but the rear row of seats didn’t fold flat, so it wasn’t any more usable. We stuck with the Explorer which was great for our purposes.