any chance either of you have any more feedback on the Simarine?I went a little nuts with the wiring on my trailer (not a SoCal, but same difference here). I originally went with a flexible solar panel but later decided on a 100 watt folding panel I could place where the sun was. This has worked out better for me at keeping the battery charged with solar.
For battery monitoring I looked very closely at the Pico One but it was still a very new unit at the time. I ended up going with a Blue Sea Systems SOC. Not nearly as nice. I wired in a single shunt at the battery to track whether or not I was discharging/charging the battery from all sources. I also wired in one of the extra voltmeters to my solar controller output to monitor that aspect. Works really well. The Pico One has some really neat options like support for multiple shunts and it's display and smart phone app make it really cool. However, the Blue Sea Systems unit did everything I really needed and all the other electrical upgrades on my trailer have been Blue Sea so that's the way I went.
For charging my trailer came with a Progressive Dynamics 4045 which was more than sufficient when attached to 120 volt AC. I'm using an EP Solar MPPT Solar Controller for solar and a Redarc BCDC-1220 for DC to DC for charging from the tow vehicle. I had discovered my 2016 GMC Canyon's intelligent charging system dropped the voltage so much when the truck battery was charged that the trailer battery simply wouldn't get above about 80% charge without the DC to DC charger.
I toyed with the idea of an inverter but never pulled the trigger. After a year I've had no need for it so it probably isn't happening at this point.