You may well encounter problems with the bulb check controll if you simply go straight to the lighting wires.
When I did mine, I purchased and installed a series of relays ( all switched by the existing lighting circuits ) but this way you are not drawing enough current to cause problems with your warning system.
The benefits :-
Much cheaper than buying a bulb failure bypass relay kit.
You also get a much better 12v feed to your towing socket ( without voltage drop due to putting more strain on the existing loom wires )
The negative :-
It does take longer to install ( a couple of hours should do it if you are handy with a soldering iron. )