I've got a '49 Restoration Pack from Chevrolet. The weight listed for a 6103 is 4680. This is curb weight. They say this is the weight of an empty vehicle ready to drive. I think that the 49 wheel base is a little shorter than your but weight should be close. What kind of bed do you have? Also the info I have doesn't mention any weight for the tandem set up.
Don
