Truck stalled many times after I took delivery, turning, stopping.

What is your question?

My G550 was staling randomly on the road when I first got it, the dealer took it in for service and upgraded the software, the problem is better, however the G550 still stalls in the automatic car wash, and the tachometer bobbles during the heavy rinse wash and blower section. Dealer took it back and confirmed water spray or compressed air blown into the wheel wells, would cause the engine to stumble. The dealer told me nothing was wrong and this was normal because water was getting into the air intake located in the fender area and the recommended cure for this was "Do not take it to the car wash"...? I find this a tad unusually for any car or truck, more less one that is as seasoned as this one, and one made for off road conditions, it should not have any issue with water splashing in the wheel wells. I find the dealers suggested cure absurd.