My 1979 Airstream Sovereign
31' has a 2" hitch, when I went to pick it up all I with me was a 2 5/16 ball. I spent two hours going house to house looking for a 2" ball, finally an old farmer had one. Carry both a 2" & 2 5/16". Airstreams appear to be like Studebakers there are always factory oddballs and dealer changes. My trailer is not supposed to have an astradome skylight, but it does.
1979 Airstream Sovereign International, 31'. VIN# I31T9J0162
1992 Buick Roadmaster Wagon, 5.7L - V8, stock 5000# tow rating, posi, aux trans cooler, rear coil over shocks, 2" rear spring lift kit, flowmaster exhaust.