I've written before about holding hot food for significant periods of time before serving. You don't have to purchase special equipment to acomplish this, while ensuring that your product is safe to serve.
However, there are products targeted at the catering and food service business that make this simple and they've beome quite popular among competition BBQ teams. Now I don't compete, nor do I cater. But I do find myself cooking large quantities for a variety of charitable functions.
It was this activity (and my insatiable need to acquire new gear) that led me to acquire a couple of Cambro Food Carriers. I'd priced these through a variety of restaurant supply websites and stores, but couldn't bring myself to spend the money for a new one. Enter, Craigslist. I kept a eye out for awhile and finally my patience was rewarded. I was able to acquire 2 slightly used Cambro's for the the cost of one new one.
The cool thing about these warming cabinets is that they have rails along the sides that will support food pans. The disposable aluminum pans that I typiclally use fit just fine also, although the lip of the disposable pans won't support much weight if you overload them. The cabinets are polythylene (that's a fancy word for plastic) and insulated to keep heat loss to just a couple of degrees/hr. The doors are gasketed and the latches ensure a tight seal.
I've been very happy with these and use them quite often. I've held pork butt for 4+ hours, and transported BBQ all over the midwest. So, if you're looking for a way to hold and transport hot food you can't go wrong with a Cambro Food Carrier.