Every manufacturer will be different to a degree as to what they'll cover and where, this is what you need to ask the camper supplier you are looking to deal with and get it in writing.
but even in writing it really doesn't mean a great deal, had a mate with a new GU Patrol Ute, both fuel tanks fatigue cracked in the Kimberely's and he was left well and truely high and dry, Nissan claimed it was abuse, the car had 10,000 km's on it. Cost him $1600 for 2 new tanks, Nissan wiped their hand off him.