This is straight from the RR4W 2011 EJS magazine.
"The Red Rock 4 Wheelers wish to
clarify the eligibility of differing vehicles
for the 2011 events, both Easter Jeep Safari
and the Labor Day Event.
These events are offered for street
legal production type four wheel drive
full-size passenger vehicles that feature a
transfer case which has a low range gear in
it. Our events are designed around this type
vehicle and always have been. Years ago
we found out the hard way that allowing
vehicles that differed from this formula
created problems and detracted from the
fun for participants. Our trails also usually
end at a different spot than where they
began, so street legality is an issue too."
"Another problem we frequently
encounter is questions about purpose built
rock crawling rigs. All but a couple of our
trails are no challenge for these purpose
built rigs, so they don’t register for them.
Since we do encounter them on a couple
of trails we must visit the issue. First, our
initial statement stands, the trips are for
street legal production type four wheel vehicles. As already mentioned, most of
our trails exit at a different point than
where they enter, so it becomes difficult
to get past the street legal aspect. The Utah
Highway Patrol enforces the Utah street
legality situation pretty strictly, and Jeep
Safari time is no exception."