A lot of C's in that range will come on a E450 Ford Chassis. That usually means they all have the same maximum weight when fully loaded. When you start looking at the specs of various rigs, you will notice that the unladen weight goes up with length, and the carrying capacity goes down. If you plan on towing, the tongue weight of your trailer, and a full tank of water (usually under the back bed) can often put the back axle into overload for long C's with multiple slides. Definitely something to watch out for. Watch your wheelbase too. Manufacturers tend to use the same wheelbase for several feet of overall length. It is better to be on the shorter overall length of a wheelbase size, than at the maximum overall length for that wheelbase size.
