IMHO any wagon will work for you. We have the Mazda 6 Sportwagon and LOVE it!! The dogs, both border collies, are 55 and 75 lbs, so they are big enough to count in your survey. They find the wagon quite comfortable, although they definitely prefer it if we have the seats folded down so they can get closer to us.

Previously we had a van that was perfect in many ways, but a complete lemon and total source of frustration. The Toyota Sienna was a good choice for space as the dogs, gear, bikes, luggage and people could ALL fit inside if necessary. And the middle side windows actually rolled down.

The Mazda has not caused us a second of trouble, and I think the dogs like it better as the windows are low enough for them to see out of easily. And, yes, the bikes ride on the roof!

Good luck and have fun!

~T~