In reply to browndog33: I have both. The bigger one is better in my opinion. However, as other people have posted, they are top tastic bits of kit. The design.has hardly changed in 30 years. I don't have a gas converter for mine, but people I know who do have rave about it.
For you and your step son, the larger one is the one for you. Obviously it is a bit heavier, but not significantly!