Having worked in the Park for a couple of summers, I suggest you might want to drop reservation at Sylvan and find another CG. We love CSP but the CG facilities are sorely lacking. No sewer and most CG have limited sites with water. Power has come to most now but still some without.
Sylvan Lake CG is very small with very small sites. Pulling that trailer with a van that big is going to be a pain just getting up to the Sylvan Lake area - narrow crooked roads both directions and there is at least one with a tunnel.
Maneuvering inside the CG is going to be REALLY tight if not impossible.
The place is not scenic although it is VERY unusual. Find another CG outside the park and drive to Sylvan and the Eye of the Needle area.
horsedoc
2008 Damon Essence
2013 Jeep Sahara Unlimited
Blue Ox tow