for my van... help me out here, I'm about to lose my mind with the fighting in my car. Right now I have a 38ish pound almost 5yr old in an Apex riding in the back passenger 3rd row and next to her a 38ish pound 3yr old in a Nautilus. In the captains seats I have a almost 55lbs (give or take) almost 7ry old riding in the passenger side in a turbobooster and in the chair next to her is my 18 month old rear-facing in her EFTA. We are going on a 5 hour car ride and my kids all fight with each other after being in the car for a bit. I'd really like to keep the 18 month old where she is, b/c its easier for me to get her in and out of the car. I'd also like to make some space in that back row seat in case I need to sit back there at some point during our trip. I also have an Evenflo Titan, a big kid booster and a scerena available (well, its on loan to a friend who uses it for her day care kid, but I could get it back). Thoughts? I've thought about booster-training my almost 5yr old, but I just don't think she's ready yet, well, maybe thats just me not wanting to let go.