Propane or Charcoal : Seperate Tank or trailer Fed?

we used propane grill with it's own tank. A small 1 gallon tank we bought at an RV supply store.

Now we use an electric grill my DW bought from QVC.
http://www.qvc.com/Masterbuilt-Veranda-196-sq-in-Electric-Grill-with-Cover.product.K41863.html

It's convenient and flavors as good as any grill we've used...charcoal or propane. We carry it in the shower