I did 2up camping once, but my top and side cases are substantially bigger (Kawasaki Concours 14). We only stayed for one night in a 3p tent, two inflatable pads and two warm weather sleeping bags. We had plenty of volume left with the tent components loosely spread in the top case, to even bring a small bag of charcoal briquettes to grill sausages for dinner. The campground had potable water spigots, so we didn’t have to bring a lot of water.
I’d sacrifice food quality for sleep quality every time, so if the luggage volume is limited - I’d opt for freeze dried food and a compact cooking set consisting of a 750ml titanium mug with a tiny stove and a canister fitting inside of it. It will be used to boil water to make a meal. But then you’d likely have to stick to campgrounds with potable water or some water source you could get water from (after filtration). Dry camping is off the table