Last year, I added a towing hitch to our Honda Pilot in order to haul bikes. However, it only made sense to go ahead and add the necessary wiring for pulling a trailer (brake lights, turn signals, etc.). So I ordered the OEM kit from HondaPartsGuys.com (great site for Honda and Acura owners!). Again, it warns that this is not a DIY kind of job in the instructions, but it really is very easy to do. The worst part was that I had to remove the hitch, bolt on the wiring socket, and then re-install the hitch. Otherwise, it went off without a hitch (no, wait, that’s not right).
I got a 7‑pin to 4‑pin adapter (most U‑Haul or other small trailers use the 4‑pin as they don’t have brakes and reverse lights). It also has a handy-dandy light tester in it, so I could verify the brakes and turn signals both work. A lot of tight spaces to work in, but kudos to Honda for designing a very easy to install system here.
Update 2020-07-18: We rented a trailer for our trip to IKEA to get some bathroom cabinets & counters.