Since there is some interest from different parties about the WRT I'll put some more do's and don't here.
Remove your jacks if they hang too low or your camper is a bit on the wide side.
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If you have air bags, forget them or deflate to almost zero, they are counter productive in this situation.
Beef up your rear suspension with either extra leaf spring, over spring and or over load extension or all three. This is to control the bouncing and rocking roll of you rig.
If you rig has a shallow approach/departure angle you'll be leaving some of your rig on the trail.
Have enough fuel to get out the same way you came in, the trail could wash out or be flooded over and this could happen over night.
Tire air pressure, I run at 35 psi and have B.F. Goodrich 285/70/17 KO2, adjusting tire pressure will be a on going thing for your rig till you get it dialed in.
Loosen tie downs, this is to keep them for tearing out or pulling down the bottom of you POC.
Another reason for having plenty of fuel especially the gassier rigs. The Nation Park list the WRT as only 100 miles,that's from the trail head to the park bountary on the Green River side. I measure it from the nearest fuel station back on SR 191 and SR313 to the trail head to the park bountary on the Green River side from that point on the Mineral Road all the way back to SR313 to the fuel station at SR313 and SR191. That's about 35+100+30+30= 195 est miles.
A must do, bring plenty of battery power for those cameras