We just got back from our first overlanding trip with the aux tank and the ARB awning and awning room. It was a 1320 miles trip from the northern side of Lake Powell at Alstrom Point on the AZ/UT border up through Grand Staircase Escalante National Monument, to Capitol Reef National Park, and up through the South Desert and Cathedral Valley to Hwy 70.
The aux fuel tank has to be one of the best mods I have done - really convenient! No more worrying or planning for the next fuel stop, no more messing with Jerry Cans
With 40+ gallons on board you can go really far and have very good flexibility. I did not get any CELs on the trip since I did not run both tanks simultaneously bone dry at any point.
We brought both our regular tent and the awning room as I wasn't sure how the awning room would work out, but the idea was to test it. It worked great, although a tight fit for two adults and a 15 year old, so, really 3 adults. We used only that, and everyone seem to prefer it over the tent. The main drawback is that it just fit the 3 mattresses with sleeping bags. That wasn't a problem at Alstrom Point (as it was warm)
Alstrom Point is a great camping spot - below a picture from our camp site at sunset.
But, at Cathedral Valley Campground where it was around freezing temperature overnight it would have been nice to fit the heater safely inside the awning room. Instead I would heat rocks to put in sleeping bags
Note that I have the 2m awning room as I chose the shorter 2m awning that fits the length of the LR roof rack well. The awning room is very nice in that all sides can essentially be zipped open to provide full openness with just the mosquito net to keep bugs out. My main concern is long term durability as the awning room seem a bit heavy to hang off the awning poles - wonder if it will hold up. We did experience some strong winds overnight, and it held up well for that.
The Hartnet Rd and Caineville Wash Rd have some very scenic spots with overview of the South Desert and the Cathedral Valley