Campgrounds in Alberta, CA near NPs

I don't believe the park pass gives you a discount on camping fees but I could be wrong. The roads are good to go. I've gone from Waterton up to Pincher Creek(hwy 6) turned west(hwy 3) until The Cowboy Highway(hwy 22) turned north and then up to Hwy 1 where you go west to Banff, etc. I continue on up hwy 22 because I'm meeting my son for a couple of weeks dry camping west of Rocky Mountain House. I pull a 35 ft 5er with the genny on the back end, so I am probably 38 ft or more trailer only. As for gennys, I haven't a clue about using them in park CGs. I have an onan on the rear of the 5er but it gets used when dry camping and we're not in a campground. If you want it you have to bring it because there are no facilities where we go. Good luck and enjoy. OOOps, as for getting into a campground without a book ahead reservation, you might be able to do it. Right now I have reservations booked for 2 campgrounds for end of June, into July and the month of August but when we're traveling we usually get to a campground early in the day ( between 1 PM and 3 PM) and haven't had a problem staying for the night with all the hookups. Last time out, we called ahead the day we were traveling because of flooding etc. We travel across the northern U.S. on Hwy 2 and almost always stay at the same campgrounds. We don't do long days anymore. So it could be beneficial for you, if you know where you want to be on a given day, to call ahead for an overnight stay.