I don't believe newer gas engines are bothered by idling a lot. However, why bother to idle, gas or diesel, when it is such a waste of fuel? Instead, let somebody else pay to keep you cool in summer and warm in winter. Advantage to a van is that you don't have to sit at a truck stop and idle. I go to public libraries and take advantage of free magazines, newspapers, and internet access on computers. You can get a free Hotmail account and send and receive e-mail all over the country. Also, go to a Dollar Tree, Dollar General, similar stores, and buy a cheap novel and sit in McDonalds and read all day for the price of a cup of coffee. Walk in the malls, watch the people go by. Stop at any large grocery supermart and sit in their grill/restaurant section and have a soda. Sit at the truckstop and watch a movie, talk to other drivers, do your laundry, but don't idle your engine. If you have a refrigerator, ask yourself if you really need to spend money on idling to keep something cold, when you can just buy it cold as you need it. And if you have a pet in the van even when you are out of it, well, just accept that you have chosen to spend money on idling to keep your pet comfortable, and I trust that you are getting enough in return from the pet to make it worthwhile.