Packing too much??

When I was little we had this children's book called Simple Pictures are Best.

The story was about a couple that wanted to have their portrait taken but kept adding more and more props to the scene. First it was hats, and then it progressed to pets and gourds and anything and everything they could grab. The picture was gawd awful and finally the photographer hinted to them that simple pictures are best and all they needed was themselves. So that brings me to the question at hand:
How am I supposed to know how much is too much to pack? I guess it might be too much when I think that all that I am packing, including two kids, a husband, and two dogs, won't fit in our Jeep and Rogue. I will pack the Rogue up with things we don't need to set up camp on Friday night like dry goods, games, and clothing. Matt will bring those in my car after he leaves work. I will bring everything else in the Jeep with the kids and dogs after the kids get out of school on Friday. Abbey and I will set up our new tent (!!!).

 It's huge! It's 16'X16' and sleeps twelve!! We decided to go all out because the dogs have a tendency not to want to sleep near each other at all. Chief often wakes us up by growling at Ruby and then we have to end up separating the two so nothing ill fated occurs. No big deal, we just want to give them enough room to settle in and get a good night sleep. Also, we think it'll be fun to have a "living room"! There are three rooms to the tent which means we'll have two bedrooms and the living room. There is also an awning so we'll be able to relax out of the elements. Fun times!
So back to packing too much, because I most certainly am! I swear we will need it all, but I guess I'll have to have the experienced camper husband look over my meticulously made lists tonight. Wish me luck that he doesn't nix anything!!
~Beth