This is the restaurant style high chair we use in the RV. We measured the height of the table to make sure it would slide underneath. Using one of these saves a lot of space in the RV compared to a conventional high chair. We got a real bargain on this chair on Ebay. You can get them brand new on there for less than half the price of Walmart.
We use a cheap dollar store plastic tablecloth for a splat mat under the high chair when she eats. It folds up to a small size, and has worked out well for our family. We keep it stored under the sink with our plastic bags.