Way late in responding this but we didn't get a chance to test until Memorial Day weekend. I bought this (and a few other options that didn't work) adapter from Mouser for $3.50
Took Mouser nearly two weeks to get it in the mail, even though they emailed the tracking number a day or so later. There are similar looking adapters on Amazon for $15.
and bought this DC extension cable from Amazon for $15.
A little razzamatazz with the polarity and it works great. Since the plug connects so well into the Wrappon, I don't like removing it from the bottom. But I don't have to - it can just unplug from the extension cable and the dongle from Mouser folds up inside the unit.
Chose the extension cable I did because the gauge/fuse (15amp fuse for the 10amp Wrappon) is sufficient and because of the exposed positive/negative - you have to switch the polarity along the way so a little extra work is required. I tried to make it as obvious as possible so no one used the cable for something else and blew it up. But for ~$20 in parts for mine instead of a full cable >$80 at resellers, I don't mind.
We stocked up on the baggies from 4thdsolar.com because 1. baggies seem like they'll last forever and 2. we don't want a toilet without critical parts to use with it.
BTW, I see Bass Pro now sells the Wrappon and supplies.
Here's my electrical handywork.
@SION1771 please share a wiring diagram once you have it figured out! It would be great to have that here as a resource for others that want to do the same thing.