I've searched and searched on this but cannot find the answer to my questions. Do I really need to splice into wiring on my 05 wrx sedan to wire my trailer hitch? I see instructions from subaru saying that with their wiring harness, you can just plug it right in. Where can i buy this harness without buying the whole subaru trailer hitch? (I like the curt one better since it's 1/2 the price and very similar)

for lighting u need a modulite to run your lighting on the trailer. i have a hidden hitch on my 04 wagon rex have a uhaul trailer on it right now. if u got ? let me know