Propane question

This question might need to be redirected but here it is anyway. I have been given a propane grill that came with my sister's new Jaco TT. Short connection hose with snap connector ends, grill and mounting brackets. It was designed to plug into the camper gas line at the back of the camper which goes forward from there to a multi-hose splitter part way from the front. Said splitter is attached to the main gas line that comes from the regulator at the tanks in the front of the trailer. I want to hook it up to my propane bottles via a long line from the right rear where the tanks are mounted to the left rear bumper area where I've built a table attachment to set it on. My question is how to attach or tee into the main line that goes to my appliances in the TC. Before or after the regulator, new regulator with that extra line built in, or after as a tee in the main line from the regulator. The grill has a control knob (high,medium, low) on it where you snap the propane line into it and I'm not sure if that is also a regulator for the grill or not but it does get gas AFTER the regulator at the tanks as set up on the TT. Getting a hose from the bottles to the grill isn't a problem, just where and how do I attach the hose and what type of brass end fittings will I need especially to have the grill hose to be able to have the gas shut off at the snap connect end. The one on the TT is supposed to automatically shut off when disconnected, has a cap and also a fail safe type lever at the fitting to be sure it's OFF. The end on the short hose that goes to the trailer hose is a male end the one on the new camper end would need to be a female fitting, that part I get. It's the connection at the bottles and main regulator I'm asking about. Hope this isn't so drawn out to be too confusing to elicit an answer from SOMEONE before I get to the propane place with improper parts. Thanks for advice of ANY kind in advance.