Did you mean AK2612? Is it either or? I mean is it a Toy Hauler VS a Diamondback ATV Rack? Will you be pulling a trailer if you have the Diamondback ATV rack? Do you need a Toy Hauler plus the ATV rack?
I can't give you any advise on the F150 I think you would know best on what your truck can do. Having said that, if you do upgrade I would consider going with a one ton vs 3/4 ton Especially if your planning on carrying two ATV's on the truck and pulling a Toy Hauler at the same time..
I have had several Toy Haulers. I did have a Rack Lift system made by Rampage to drag my Harley in the back of the truck for a while in between Toy Haulers and I hated having my bike out in the weather. the system worked OK but it's much easier to load the bike in the back of a Toy Hauler vs loading in the back of a truck.
If you decide to go Toy Hauler I would consider a enclosed garage model. It's nice to keep the bike, mud, dirt and sand in the garage away from the living space. The garage does make a great extended living space (man cave)when the bikes are out...
2017 Coleman 300tq by Dutchman Toy Hauler. 34.5 feet long and under 10k Gross. 500 watt Solar 2000 watt Inverter, 1999 Ford F250 2WD 7.3 4R100 DP Tuner, S&B Cold Air Intake, Gauges, 6.0 Trans Cooler, Air Bags.