Why would Hunter-Douglas not give the same warranty for a RV as for a home??

[JetHot]

I am considering the purchase of a Newell and there are a couple of electric blinds in the unit that had been damaged by a dear little pooch and one that's not functioning at all. The dealer said noway would he be willing to replace them since this coach is consigned by a probate court. I called Hunter-Douglas to ask about where to find a replacement and I told her the lady that one was not operating at all. I asked about warrantees, she replied back that they have a limited lifetime warranty in a home to the original purchaser. I asked what about an RV, she replied back that RV's are not covered. She couldn't tell me why. I was wondering if anyone knew why it would matter? A home is a home correct?