In many cases, it is not possible to rent a BBQ at the holiday destination. If your accommodation does not have a BBQ, you should assume that you cannot use one. Sometimes a campsite/holiday park has central BBQ areas, if this is the case at the campsite/holiday park of your choice, you can find this under the facilities tab at the campsite/holiday park of your choice.
Sometimes during the season, a campsite/holiday park may change their policies regarding the use of BBQs. For example, during times of extreme drought, there may be a complete BBQ ban in effect.