Yeah, I know it can be done in a day...most folks say to take your time and stay out there 2 or 3 days. Maybe with an early start it isn't too rushed to go around in a day, I dunno. That would save the trouble of making camp twice. Maybe on Monday before ZuZoo?
I was looking at the map, and it turns out I have been on a piece of White Rim...some years ago I went down the Shafer Trail with a coupla other rigs (don't remember who, probably 8 or 9 years ago). Looks like we went down Lathrop Canyon to the river, then back. Those switchbacks are awesome.
Keep in mind that if you do want to camp in canyonlands you'd need permits to do so and now would be the time to apply, they tend to fill up very early.