Morning, this is the first year we are trying to go from NY to FL end of December, we were wondering if we need to make reservations at campsites on the way or is there usually several open sites at camp grounds so we can drive as far as possible on any particular day, we are looking for electric as we will probably need heat, can we just call ahead that day? is Flying J parking lot an option? Not sure if we will travel 95 or 81, probably get to VA on first day. Any hints or advice are appreciated. Thank you in advance for your time and assistance-JMC