I have not had my truck & camper towed but I have had my daughters car towed a couple of times recently. A few things that I have found out are even with coverage (I have AMA) the towing companies are the BIG difference. Around here the towing company has everything and can winch a semi on a flatbed or bring out one of the big wreckers to tow you or a small truck to get around a parking garage. But in some locations you are limited to one tow truck and that is it, if you are too big for him you have issues.
Like has been said you also really have to explain the situation as the call centers have limited knowledge as what we are talking about. I was told if I have to call about my truck and camper to make sure that I relay to the call center that my rig weighs 10,000lbs and that the camper is attached to the truck. Otherwise the tow person will be told that he is towing a truck and the trailer can be dropped. You may have to have a tow unit come from further away to do the tow as well and if this is the case make sure that you tell them that you will wait for the bigger truck / unit to arrive.