Hi Stephane, We did a very similar trip last Sept. Flew into Las. Vegas, rented a camper van, visited the Grand Canyon, and 7 Utah parks for two weeks. This was our first experience with Campendium also. We made reservations for the Grand Canyon, North and South and Zion only. All the rest were from what we found on the Campendium site. Believe it or not, we were also pretty new to using a smart phone, only having had it for a month. I tried to write up a review on each place we stayed if you want to look us up on here. We had a great time, hope you all do too. And ditto to what the other 2 comments were, don't trust a tent only site.

If you will pitching a tent and sleeping in it, then you can book a tent site. Otherwise, you will need to book an RV site.

It will depend on the campground policy and the site. Some tent sites will have room for a camper van, while others are walk in sites and probably would not be suitable for a van set up. Hope you have made reservations for the national park campgrounds. Fall is a busy time of year and you could have snow at higher elevations.

Generally any sort of RV/camper/trailer/van will not be allowed in a "tent only" site. The sites may have only a small car-sized parking spot and the actual camping spots require walking into the site, off the pavement and sometimes through rocks or trees, so your vehicle can't drive into the camping spot. If your vehicle is the size of a regular mini-van and fits in a regular parking space, and you are actually planning to sleep in a tent, then this type of site might work for you.