Truck Loading/Transporting two PA 12s'

My wife and I are New PA12 owners and can't wait to get the "Maiden Voyage" under our belt. We currently transport them on a Backflip CS cover and rack for our truck. What is the best way to transport/load both our yaks on our truck? A trailer is no option as we got them for the sole purpose of dragging a travel trailer when we go out camping with the yaks. We thought a "Hullavator" would be the way to go even though the PA12s' weight would be at the limits of the hullavators. When we arrived to pick up the yaks, the yak dealer vehemently encouraged us NOT to use the hullavators. In their past experience, the hullavators cannot handle the weight and break down. I don't feel they were just trying to steer us to buying their system as they researched with me what the best way to tie them down on the truck rack. We ended up with a roller system from Yakima. As you know the yaks are 100lbs a piece and the rack can handle 500lbs. I think the rack will hold the weight but just looking for feedback from others on how you guys truck load/transport your PA12'.

Thanks guys/gals!!