Starting my journey with Fur Babies

I'm going to get into RV Life in may and I want to bring my Dogs.  I have only been able to find 40 lb bags of the food they eat, but I'm in a small camper.  Does anyone else deal with this?  What are your suggestions?  

I considered perhaps keeping the bag in the back of my jeep, but perhaps getting a smaller container to serve their food out of to keep in the camper.