Having driven a number of the intermediate wagons, I think you'd be hard-pressed if you're carrying all of that and 5 people. The suitcase and stroller should easily fit in the back, and maybe a few of the carry-on suitcases, but the rest of it would probably end up in the laps of people asking you why you didn't book something bigger.

However, since it's just a matter of getting to the hotel, maybe consider leaving a few behind to get a bite at the airport? If you could get the seats folded, you'd swallow all that luggage no problem. This is the guy who moved from Victoria to Edmonton in a Matrix last summer, one bedroom worth of stuff (no furniture), so midsize wagons can pack quite a haul when people aren't involved.

As far as the vehicle, I say try for a Kia Rondo. It's got the most room of all the wagons offered in the midsize class, and I've managed to fit loads of stuff without folding any of the seats down. Good luck!