Yep, been discussed a lot, but I think protection from fire is a pretty big deal. Maybe it should be in a separate thread.
mcnabbwr found the link I was looking for and it's really good info. Some of it is direct quotes derived from approved FAA training manuals. I realize FR will try to make a profit anywhere they can, but fire protection is not an area they should skimp on. Halon bottles can be obtained for $200-$300. At least on the motorhomes the extra cost would be insignificant.
Most fires in RVs are caused by cooking incidents or electrical problems. I think that if one is traveling down the road and had an electrical problem it would be a lot safer if they could just grabbed the halon bottle and aimed it generally toward the back of the MH. It would give an additional few seconds to get off the road and evacuate.
Personally, I'll stick to halon only for fire protection. Have three bottles in the TT, one in the truck, one in the car and seven in my house.