rv to alaska----- campground reservations

Thanks for all the comments and help. Maybe I am too excited to get there being my first trip there. Taking a slower pace coming back. Knowing that I may not make as many miles on certain days prompted me to question whether to make or not worry about reservations. I think most comments I received did not think reservations were absolutely necessary. We plan to take about 2 months total travel. Should arrive there ( Tok) in mid June and leave at the end of Aug. We will travel in a class c on a Sprinter Chassis. Thank you all very much.