Det,
After seeing an RA bumper up close I totally understand your predicament. RA didn't address the issue of proper solenoid placement so the customer is faced with where to zip-tie it.
I would suggest attaching the two grounds to the bottom of the winch then mounting it, finish wiring it and then placing the solenoid somewhere close so that you have some slack in the wires. If you ever need to remove the winch you'll need the slack so you can partially lift out the winch and unfasten the grounds from the bottom of the winch before lifting it all of the way out. I'm assuming you're using a Mile Marker winch, so you'll need an extension for your hand-held remote. I hope they supplied one.
I've got pictures of the RA set up if you'd like to see what I saw.
Don't get the Optima yet. Wrangler NW is going to have a dual battery system within 2 weeks. Very trick setup.
And asking a question isn't stupid unless you know the answer and ask it twice.
