Many choices, really comes down to your personal preference. One thing to consider when hooking to T on trailer tanks or the quick connect on the trailer, the hose can become a safety hazard if people are going by between the bbq/grill and trailer. I have both setups (quick connect and T, both came with trailer), but we use an extra 20# tank to run big campstove, bbq, propane lantern, propane fire (when wood fires are illegal due to high fire danger). I can refill the disposable cylinders if needed also.
I like to have all the cooking and food stuff inside screen tent to keep the bugs from bothering us.