I haul my RGU a fair amount in my ram 1500, I have a rampage lift but the bike still gets strapped to the truck for actual holding down, I have never had a problem with the truck mounts.
A small bit of advice when strapping the bike down. I will strap the front from the bottom triple tree to the front, then strap from the from of the downtubes above the crossover to the back of the truck, this will keep the bike from rocking back and forth on an emergency brake situation, then I strap from the saddlebag rail to the back also to keep the bike from hopping around.
If you have or can borrow a chock that helps keep the bike steady. And check the straps after a few miles because they WILL stretch especially if new.
A small bit of advice when strapping the bike down. I will strap the front from the bottom triple tree to the front, then strap from the from of the downtubes above the crossover to the back of the truck, this will keep the bike from rocking back and forth on an emergency brake situation, then I strap from the saddlebag rail to the back also to keep the bike from hopping around.
If you have or can borrow a chock that helps keep the bike steady. And check the straps after a few miles because they WILL stretch especially if new.