I've not had to change a flat on the road either, but I've learned that it is difficult to get a jack under the Lance at the jack pads. Not something I'd like to do on the road.
Gary - PAU HANA - carries two of these in his truck. He has a well documented long trip on this forum with significant tire problems. After talking to Gary at Shingletown, I decided this was a must have for us. Found it on Amazon for about $54.00 and no shipping on Prime. Comes in a nice, very useful box that I'm going to use for travel.