I would say it depends on what you want done. If it is "Airstream" specific, you would likely be better off taking it to an Airstream dealer or somebody that knows what they are doing like Frank Yensan @ Franks Trailer Works in Baltimore. If it is "systems" stuff like the furnace, fridge etc. then a local, reputable dealer should be fine.
1999 28' Safari
2012 F150 Platinum Max Tow 7650 GVWR 3.73 Elec. Locking Diff.(Prev 2003 Dmax).
Honda EU2000i, Equalizer Hitch
AM Solar Panels 150W - 2 Trojan T 105 6V Batteries
On internet forums, please research and separate the wheat from the chaff (including mine!)