[pct-l] Etna Summit question

[Marion Davison]

I'm thinking about using Etna Summit as a trailhead for two out and back 
hikes this August.  I haven't been able to get any info about the road 
from Etna to the summit.  My rig is a long dually van pulling a trailer 
for the llamas.  The total length of the rig is 36 feet.  We have had 
some real problems getting this rig to certain trailheads.  We won't 
ever do Horseshoe Meadow or Onion Valley again.  We even have trouble 
with the roads from Lucerne Valley to Baldwin Lake and from Hesperia to 
Crestline. 
The drive down the hill is just as bad as the trip up. 
Can anyone tell me about the Etna Summit road--such as the percent of 
grade, warning signs, hairpin turns, other concerns?  If driving up 
there is a lousy idea for me, can you suggest another trailhead that 
would get me close to Trinity Alps or Marble Mt. Wilderness?
Marion