It's nice to meet another owner! There aren't many of us yet as these are new for this year.
I have maintained my battery by simply plugging it into my house power. I am sure there's no risk of cooking the battery. I also charge mine with my my tow vehicle(s) while driving. I also have a 100W solar panel and will be adding it to the roof. I'll be able to dismount it so I can "follow the sun" while camping.
I am new to converters but I understand they are commonly used in RV's. I am much more familiar with inverters. I am thinking of adding one but want to make sure I don't screw anything up (i.e. - the battery) with an additional electrical system. BTW - I replaced the battery that came with the trailer with a Group 27 deep cycle battery.
It's a bit frustrating that these don't come with a wiring diagram. I am slowly making my own. No doubt you found a lot of loose, "un-loomed" wiring under yours. I have started to put it in to proper wiring loom. Underneath you can see everything but in the cabin you can't find any wiring. I "assume" the converter is hidden behind the breaker/fuse box … which you have to get on to your hands and knees to read.
I've started to modify mine and will start a thread as soon as I make a bit more progress. So far I've replaced everything on the tongue and added a box, stiffened up the rear of the frame and added a 2" receiver as well as done some minor things in the interior. I making a roof / kayak rack and should have that done in a week or so. I'll be swapping out the axle for a 3,500 lb. one plus adding 15" wheels & tires. I'll also be adding square fenders and running boards.
I used mine for the first time this past weekend and everything went well. It went down to about 45* on one night and it was so warm inside that I didn't even bother with the heater.
Here are a few pics from this past weekend ... the vintage races at Mosport, Ontario.


… and a few of the mods I've made so far …
The tongue …

And the spare wheel under the tongue …
