Not trying to sound sarcastic , but a flat tire is a flat tire , it doesn't matter if its on the MH or toad or trailer being towed. When you have a flat your pretty much sitting on the side of the road (per say).
It should be covered on all three plans ,anything more than a boat trailer its only covered on platinum or platinum+ plans not the standard...
That maybe something the powers that be could address and add to all three plans.