any RV dealership or shop should be o.k., as they'll all have to make the request thru THOR beforehand anyway. Thor does not 'limit' you to who you can use, but they DO pay a 'standard' warranty rate, as any factory does.
enjoy : )
'14 Palazzo 33.3 bunkhouse 34' diesel
KingTailgater2 Dish HD, 100w/5a SOLAR, BlueOx
100,000+mi since '14 - US, Alaska, Canada - Hiawassee, GA! (also, '14 Gulfstream Amerilite and '07 ForestRiver Rockwood) : )