It does appear that the regulator heat control is all one unit on your grill. I have the Baby Q and the regulator simply unscrewed from the control and I was able to adapt a QC to the control and run off the low pressure side of my system.
Personally, before I would go adding tees and connectors to the high side of your propane setup. I would spring for a grill that would allow adaptation to the low pressure side of your trailer. With the correct fittings, that would enable you to use the same LP output that you use for any other outdoor appliances with no additional plumbing necessary. I have an outdoor kitchen with a stove and my setup allows me to use their the stove or the grill off of the same QC. All I did was extend it to the edge of the triailer using a pipe nipple and a coupling. Some shopping around on the Internet will turn up a couple of manufacturers of propane fittings. Mr heater makes a complete set in both sizes. My Keystone uses Fairview gas connections and they are also available everywhere on line and you can order just one side if that's all you need.
Just so you know, the quick connect fittings that Home Depot and the other hardware stores sell for air compressors are not suitable for gas connections. You'll have to find them at a RV place or somewhere that specializes in Propane equipment. Hope this helps.
2013 F250 XLT
I now have a Keystone Outback, but I try to help when I can.
Bitter Gun Owner