When you live where i do, you carry spare parts because you never know..... be up on a trail in the mountains and pump takes a crap no cell service yea its gonna be a LLLLOOONNNNGGG Walk...

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its also nice because two of my tractors are cummins powered had a water pump go out and had one in my truck so I threw it in and a gallon of anti frezze and done! saved a trip into town...

 

There's nothing to the water pump, you could keep it in your glovebox.

 

I just may do that. I usually just carry a few spare fuel filters. But, I see whatcha mean. Im just not a fan of making roadside repairs while pulling a travel trailer.