additional heating

Houghta

well theres a nip in the air so i thought it was time to ask this question,

our motorhome an elddis autoquest 145 (2012) has a whale 2kw underfloor heater feeding 2 outlets and we have a taylormade external screen cover, i was wondering do you think this will be sufficient for over the winter (this is our first winter motorhoming)and
can you recommend a suitable additional plug in heater in case it is not, we usually always go on hookup so it can be 240v as long as we dont exceed the ampage limit

cheers,