There is no free camping in Swiss, campsite is 5 minute limp to boulders. At last count I think it was 5 francs a night, maybe showers now but didn't used to be. Parking and sleeping in your car will be frowned upon. Motor homes stay on campsite parking. July will be good and one or two pads will be fine, there are always pads hanging around. My rule of thumb with them is if it's a weekday i'll use them without straying too far, but if it's wknd I'll leave them. Midweek is generally a lot quieter