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My dealer told me the same thing and I asked him has he ever driven the sand...he said no. Then I asked could I get the optional skid plate installed...and he said whatsa skidplate? From then on I didn't pay much attn to him. Bought the truck had the skidplate and forward receiver installed and have been happy with it.
With regard to those buttons...What John said.
My YukonXL has the same buttons Auto4wd, 4-hi, 4-lo. and 2wd.
If I am in bad weather on the road (snow ice ect) : auto
dry roads good conditions, highway driving : 2wd
sand or heavy deep snow or pulling my boat up the ramp: 4-wd
Pulling the boat out of a nasty steep ramp in poor condions (slimy loose rocks and sand.) 4-lo
I have only been in 4-lo once in the last year
Frankly I think you *could* run around in auto all the time and not have any problems. Those systems today are very smooth and reliable. But if you know your are going to be in a heavy demanding conditions...commit the drive train to a dedicated mode.
If you want to take the strain off your drive train..AIR DOWN to sub 15psi in the sand. I wish they would start writing tickets to guys that don't. IMO this does more damage to the beach and makes much deeper bumpy ruts for others not to mention the wear on your entire engine/drivetrain.
Good luck with your new vehicle...new trucks are fun.
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