if you get an intex and want to stay with their equipment, do get the big pump and filter, especially if you may want to get the little robot cleaner. I think the pump and filter you have will be fine (if not much better). you may need to play around with fittings, but search around for how people have modded their pools. running two pumps at once is overkill (and potentially expensive on the electricity). having a spare for when your main one goes out during the heat of summer can save a lot of worry and potential algea outbreaks.
you don't need more pump/filter to have the skimmer. a skimmer is great for keeping surface clean (and helping to prevent the bottom from getting as dirty), just about any pump will move enough water for that. it has its own basket for leaves and such. many here also add disposable hair nets and they catch a LOT of stuff before the filter does, reducing the need to backwash or clean. it is the circulating, and things like running a cleaner or vacuuming that need more power. after reading your camper build, I expect to see your pool hard plumbed and lots of homemade PVC projects to go with it. search the site for ideas.?
you don't need more pump/filter to have the skimmer. a skimmer is great for keeping surface clean (and helping to prevent the bottom from getting as dirty), just about any pump will move enough water for that. it has its own basket for leaves and such. many here also add disposable hair nets and they catch a LOT of stuff before the filter does, reducing the need to backwash or clean. it is the circulating, and things like running a cleaner or vacuuming that need more power. after reading your camper build, I expect to see your pool hard plumbed and lots of homemade PVC projects to go with it. search the site for ideas.?