By bigger, if you mean longer you’ll find there’s nothing in it
For sure – length is the same but a Transporter is 10cm wider than a Caddy Maxi and feels like a much larger vehicle to drive. I went through the same decision making process 11 years ago and just traded our 08 Caddy Maxi Life in for an 18 plate Caddy Maxi Life. 3rd row of seats are never in it.
Front wheel off, pedal hooked onto side trim, rear wheel wedged against the foot of the seat that’s folded up. Nylon strap around the fork crown and to the rear tie down point. (we do it with two bikes and the single seat down but works the same the other way – you can easily get 3 bikes and 3 people in that way.) Admittedly we’ve never had a smash but the bikes have never tipped over.
With >1 bike blanket between each. outermost bike tied at the fork. Strap through the rear wheels keeping them together.