Any ideas on how to carry yaks on truck while towing trailer

I may buy a new truck to pull our travel trailer and I am looking for ideas on how to carry my yaks. I am thinking lumber rack or alike; however, I want to put a tonnnau cover over the bed and that may prohibit mounting one or the other. I once saw in a parking lot a truck that had something mounted from the front of the truck that looked like it lowered the yaks from the front. Anyone been down this road.
Thanks, 

Contact Bill (Snapperhead), he has a rack that carries the yaks over the cab and hood allowing him to pull his 5th wheel also

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1) If you install a front mount hitch
2) Install something like this in the front hitch:
https://www.amazon.com/Tricam-SLE-1-Extender-350-Pound-Capacity/dp/B00HDL2DX6/ref=sr_1_3?ie=UTF8&qid=1473174484&sr=8-3&keywords=kayak+hitch+rack

3) The rear would be on your cab on a regular Thule/Yakima bar.

Hope that helps.

If you wanted to spend the cheddar have a metal shop custom fab a lumber rack that sits flat on the bed rails and comes around the tonneau cover similar to the ones wrapped around a canopy. Could they ride on the travel trailer?