Lightware RC1048 Rolling Stand Bag

Yes one of those stands can fit but it will be tight.

Yes the Matthews Hollywood Beefy Baby Triple Riser Stand will fit into the RC1048.

This case would have room for a broken down c-stand turtle base.

Having traveled thousands of air miles with camera gear, I can only say that checking bags for said gear is a risk you do not want to take. I recommend a hard case for all your checked gear.

I would guesstimate that the exterior side pockets are about the same as the interior and about 36-38 long.

I can't answer if it will fit your Subaru but I can tell you I really like this case. It holds four Manfrotto stackable stands plus a Cheetah stand and a bunch of adapters in the main compartment. I have multiple 45 umbrellas and a 3' Profoto Octi in the pockets. You should know if you are going to fill it up the width can increase substantially. I just measured mine as nearly 17 across, and I would not call it overloaded. I love rolling into a gig with all of my lighting in one bag.

I am not familiar with those stands, I will say it's a great bag.

I fly with this bag monthly and I've never had an issue with an airline accepting it in checked baggage. I fly Southwest Airlines a lot, and as long as it's not more than 50lbs, they've never charged me for excessive or oversized baggage. You can get a lot gear in this bag and keep it under 50 lbs.