Two different times this summer while towning my old Terry 5er I had flats.. It was my fault for not checking tire pressures prior to my trip and also cause the tires were 14 years old (mind you they did not look bad at all)...that being said..
I had checked to make sure there was a spare on the coach but never even took the time to make sure there was air in it... again another mistake on my part ( i was new to towing what can i say..lol)
Then it happened..at 70 mph coming south on I-75 on a Friday around 6:30pm..In the middle of the state where there is not much other then corn fields.. I pull over and the first thing I did was drop the spare and found it was in good shape (it even had air in it..whooo hooo)
Then I took the bottle jack out from under the hood of my Ford, and got the lug wrench that came with the coach. That was when I found out that the lug wrench did not fit the lug nuts.. so then i was in a jam to say the least..
I wil make this short... from there I called AAA cause I have towing on my truck, just to find out that the trailer is not covered... the did dispatch a wrecker to me that was able to chance a tire on roadside.. (there was only one company in the area that would do that) He got there and used his own pneumatic bottle jack changed the tire with out any issues and it only cost something like $90 BUT...he told me that if my spare would have been bad or if I would not have had one at all there is nothing they could have done to help me.. they DO NOT have tires..and the only tire shop in area was closed..
So.. after that trip we were leaving again in just a couple of weeks.. during that time I bought a cheap floor jack, 1/2 drive breaker bar, the right size deep socket,and got a new spare...all very inexpensive minus the 100 dollar tire.... and its a good thing to cause we got another flat on our next trip...but cause I had the right tools I was able to chance it on my own and it took like 20 min..
Then only thing I would say is do not use a floor jack, after using it I traded it for a bottle jack cause you have to get under the trailer to use a floor jack and thats not a good idea on the side of a freeway.. you feel every car go by.....
Also with my new coach it has aluminium wheels so I bought a torque wrench to make sure they are keeping the 100 foot pounds of tourque they are supposed to have....I will no longer just take tires for granted.. I got out of it fairly easy, but it could have been a nightmare..