I still know people (not immigration tho) who will let you use a tabien baan as a place of residence for that paper.. Approx same cost thogh they wrap it up in doing all the regwork too (often even if essentials are missing)..
Red plates.. New car.. Sounds like things are going ok
Agreed for simple stuff (extension of stay) you would get exactly the same ruling from either place as its within the basics..