Unfortunately, Airstream wasn't big on documentation in
1955 and 'Owner's Manuals' weren't "a thing" until
1964. I did find these sales ads on their website:
But neither mention total weight.
There is this '
Specs & Price List' on the Airstream website for
1956 tarilers, which I'm sure is pretty close to the 1955 models. It lists the
1956 Overlander model as weighing n at 3,297 lbs. Keep in mind, the weights listed are dry & without any options or gear. Generally, they got heavier over the years - but I'm pretty certain one year wouldn't make a big difference.
The only concern with your restoration being heavier than original, would be the extra weight on the frame & axles. If your frame was beefed up & structurally sound, it shouldn't be a problem...
Shari