For sale: travel trailers / lakewood, nj description: 2015 Airstream International Serenity series 23d oyster ultraleather interior, many options stock#10368 msrp:$75,107.00 lowest price guaranteed, we will not be undersold!!! For a full description, floor plans, features, specifications, additional photos and options for this Airstream please visit our colonial Airstream website: features: fresh water tank capacity: 24 black water tank capacity: 18 grey water tank capacity: 21 # ac units: 1 ac specifications: 13,500 btu payload capacity: 1239 hitch weight capacity: 720 interior color: oyster/ asian sand exterior color: silver