When I was in my 20's and backpacking with my buddies, we let our EGO's get the best of us and we carried our own spacious 3-man 6lb tents instead of teaming up. The same went for to much fuel, can goods, fishing gear, etc. As already mentioned, and since you will be in a group, try to share your gear when ever possible to keep it light.

P.S. This is a great site....