It sounds like you're not getting a signal on the brake light circuit anywhere on the plug of the Curt # C56258 and there are a few things you can check out here.
I would start by just making sure that the ground wire is secured to a paint and rust free spot on the vehicle's frame; this all could just be a situation where the ground isn't sufficient to power the brake lights. Next, you'll want to start testing out the wiring behind the harness on the Curt # C56258 and then where it plugs... view full answer...
The tires on the Yakima Rack and Roll trailers # Y08106 and # Y08107 are indeed specified for inflation pressure of 40-psi. To lose about half that pressure after a year-and-a-half of storage is not at all surprising, but for the two tires that lost all of their pressure I suggest some further testing before you embark on your 2400-mile trip.
You did the right thing by inflating all three tires to the specified 40-psi pressure so you can keep an eye on them for a few days. If they hold... view full answer...