Convert low pressure grill to high pressure grill

I have the opposite situation. My TT is equipped with a quick disconnect to run a hose from the trailer to my portable propane grill. The propane pressure in the pipe line that my quick disconnect is on is already reduced by the regulator at the tanks. And my potable grill also has a propane regulator.

I haven't tried the grill yet, but I have read where the grill will not perform well with two pressure regulators. I can't just remove the regulator from the grill, it also acts as the on/off control. :?