A 1.7 CF fridge is very, very small. Go to Wal-Mart/wherever and look at their little dorm fridges and pay attention to the interiors of the different sizes. We are running a 3.2 CF under counter refrigerator. There are three of us living in the RV... (my freezer is 4.4 cf) I cannot put a full gallon jug of milk in the fridge (we use non-fat dry milk that I reconstitute in amounts as large as 1 quart... it lasts longer than regular milk). I am very limited in how much "leftovers" that the fridge can hold. I make a lasagna that is made with uncooked noodles and sits overnight in the fridge before baking. The 13X9 pan will not fit in the fridge with everything else. The inside dimensions are 16W X 21H X 10D (not counting the "door" area that you can't put anything in because the door shelf fits in that area when closed) and there are shelves in there too. If at all possible, go with a 4 CF fridge (we also have one of them). The difference between what we can put in the 4 Cf fridge and the 3 cf fridge is amazing... the extra 1 ft means many bottles/containers can stand up not lay down (and leak). Measure things like condiment containers, drink containers, a dozen eggs (I cut egg boxes into 6 packs as they fit better that way) and see if they will fit. We used to have a 1.7 cf fridge in our pop-up. We also camped for a week at a time and lived long term in it as well. During the summer, we would keep drinks a cooler simply because there wasn't enough room to store milk, plus eggs, sausage, meats, cheese and the like.
Rather than a 1.7 cf refrigerator, I would invest in a couple of Extreme/5 day coolers and freeze jugs of water at home added to a couple of bags of ice. Line the lids (interior) with Reflectix and that will make the ice last longer (mine are held in place with Velcro). Keep them in shade as well.
This is what we did with the lids of all our coolers. It will help hold ice for a longer time. This one is a Coleman 5 day cooler.
This igloo cube is our soda can cooler for the food cart. We have a water/ice slush that will freeze up the sodas during the day, even during the summer. We have the coldest sodas in town during the summer. Overnight, David has had to chip the ice off of the cans.
The pics are of our coolers that we use on the food cart. They are open/closed all day long. We often have ice the next morning (we buy ice daily Monday-Friday in the AM). On weekends they stay shut. Sodas tend to hold ice thru to Monday morning when David drains off the excess water to start all over again. Prechilled sodas help the ice last longer. Warm sodas will melt ice pretty fast.