We just returned from a near identical Maze trip, so no new thread. As for the long wheelbase, we passed a full-size Dodge with a slide in pop up out near Dollhouse. Just take your time.
As for the rest, we were a little bit disappointed. We were glad we went, it's just one of those "had I known/if I did it again" things. The solitude was nice, the wheeling was fun but a tad monotonous and frankly the scenery was less spectacular than other parts of Canyonlands. Maybe we're just getting old, but it just seemed like a lot of effort for the return. Add to that, we have done most all of the rest Canyonlands. To paraphrase what LilKJ said, the SW area (mostly BLM) can be equally remote, just as scenic and far more interesting. Stuff like that dry fall with the Petrified Wood littering the ground is what does it for us. By the way, we climbed around a bit at that site and kept finding Petrified Wood the higher we went. So likely it did wash down from the bench above. Read, need to explore more.
If I were to recommend a route now, it would be to enter from Poison Spring Canyon/North Hatch Canyon, camp/explore for a day or so (all BLM so far). Then get up EARLY and do an out/back (a really long day) to the Dollhouse, only if you are not a regular to Canyonlands. Following that, explore more of the North/South Hatch and Happy Canyon area. Then exit back out Poison Spring or to Hite. Poison Spring would allow for exploring all the things you didn't on the way in, Petros/Pictos, mine sites, Lith scatters etc. All with no reservations or permits. By camping on BLM you retain the flexibility to deal with weather should it occur. The reason for entering at PSC is if the Dirty Devil River can not be crossed it will result in only a 15 mile backtrack as opposed to 65 or more. There have been numerous washouts, undercut banks and deep holes developing at that crossing this year. Hanksville BLM office or Hans Flat Ranger station frequently do not have up to date info on the crossing/area. The USGS has a gauging station at PSC/Dirty Devil and up to the day CFMs can be had online.
Also, just when you think you are getting away from it all, while checking in at Hans Flat, a voice from behind says "Hello there neighbor". It was our next to next door neighbor. A small world indeed.