Any Good Motorhome sites on the UK South Coast ?

HiYall.. Leaving Yorkshire on 15th October for our mammoth tour of Europe for a couple of years.. but first need to pop down south coast to visit family and say our farewells for the week, does anyone know if there are any good motorhome sites between Brighton and Bournmouth that has electric hook up, etc.. that you can recommend, i know about the one at Hayling Island but also know the road to get to it.. ha.. not easy even with a car.. we are 13 mtrs long with motorbike trailer and 3 mtrs wide and left hand drive, so all the obvious problems getting down country lanes and arriving on sand.lol

Thanks in advance