Greetings from the Florida Panhandle
First off, welcome to the Forums. We're glad to have you with us.
One thing that you need to remember with an Airstream slide-out unit is that it adds quite a bit of weight for the meager 12 inches that you gain. You are going to have to tow an extra 1000# over a similar non slide -out unit. Since the SO is forward of the axles, it also adds significant tongue weight.
SuEllyn & Brian McCabe
WBCCI #3628 -- AIR #14872 -- TAC #FL-7
2005 25' Safari FB (Lucy) with HAHA
2005 Suburban 2500 Quadrasteer (Olivia) & 2011 Silverado 3500 (Fred) with Outfitter Truck Camper (Ethel)