There is a pucker factor in driving the ATVs up on the above the rail racks. I've also seen them winched up as well.
What style of ATVs are you talking about? Large utilities or sport quads?
IMHO if you are close on your number with the F150 you're probably going to not like it as you'll probably be overweight and then forced to get into a bigger truck. Not knowing your F150 specs for the AK2612 specs it's hard to say for sure, but that 1000# hitch weight is the weight before you load up, many assume if you load your ATVs in the back it will take the weight off the hitch some, but in reality is really doesn't.
Feel free to drop by the Toy Hauler forum here too.
Two Wire Fox Terriers; Sarge & Sully
2007 Winnebago Sightseer 35J
2020 Jeep Gladiator Rubicon