Iam not sure what you mean by tiffin great warrenty in the past but slipping now at all?
we had multiple issues with our coach(not saying it can not happen with other brands) we had 2 probems pre authorized by tiffin to be repaired, the dealer was backedup and we had a trip planed so we said we would bring the coach back. We returned the coach to the dealer a month later(still u der 1 year warranty) I was informed tiffin withdrew autherization to repair, I spoke with tiffin rep he said tiffin was no longer fixing those issues umder warranty.