Most times when we run from west georgia to Anchorage we take a good 20-25 days, but last summer we had to push it to get home from AK. We have traveled from our home in GA to ANC, AK and back several times.
We came back from Anchorage down to southwest of Atlanta last summer. (we're 8 hours north of Canaveral)We pushed it rather hard as we wanted to be home in time for the birth of a grandson. It was steady movement for all 14 days an no time for sightseeing along the way. We'd get up early and hit the road and stop by supper time every evening. Like you we always do full hook ups for comfort.
Make sure you use Milepost coming down the Alaska Highway at least to Calagary.
I liked the roads best from Calgary down to I-15 through Montana to I-90, then down through Sheridan, and over to Souix falls, SD. Then down to KC and east to I-24 to I-75- then down through ATL and for you in to FL. The roads were great until Sioux Falls then they started getting congested especially around the larger cities, but we used bypasses around them and strived to hit them during non-commute hours. Made it just in time. You definitely can do it in 14 days but your going to have to make pretty steady time.
We found good campgrounds at Tok, AK;Yukon Hotel and RV park ; Toad River; Edmonton;many good CG's in Montana, Sheridan WY, many CG's around Rapid City/Black Hills; then lots of campgrounds from there on with full hook ups.