I agree with Sunbird. It's only about 4 hrs or so from Lake Louise to Jasper, so plenty of time to do that and the snocoach tour. Would suggesting skipping the "Glacier" Skywalk. It's nowhere near any glacier, and gets very mixed reviews. This year they bundled it with the snocoach tour - a pretty sure sign they felt they wouldn't get enough people visiting it unless it was a package "deal". You can get separate tickets for the snocoach tour at the tourist office (not the Parks Centre) in Lake Louise.
That way you can book a campground. At 30-32 ft, you're going to be beyond the suggested length limit for any of the campgrounds along the parkway with the possible exception of Rampart Creek (and one other?). Doable, but only if you are experienced in parking/reversing such a large vehicle. You might be able to find a space, but if campgrounds are full or you can't find one with a space that's large enough, you've wasted a lot of time/energy.
I'd probably just book an extra night in Jasper. The Columbia Icefields are only 1-1.25 hrs from Jasper, so can be done as a day trip or you can start early, then do the tour first and have the rest of the day on the parkway. There will be plenty of daylight.
