When I went to Moab I rode a 100 mm travel Santa Cruz Superlight, my brother was on a Superlight as well, but with 80 mm up front. Years prior to this he always rode a Yo Eddy with a 63 mm fork on it and never had any problems. In other words, your skills are more important than your bike. Just go with what you have and have a good time.
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I may be fat but I'm slow enough to make up for it.