It wasn't being towed by anything recent, but we had an ego small travel trailer list with us recently.
LFP bank was comprised of 4x100Ah batteries. Fed a Renogy 3kw Inverter, Inverter also charged batteries when plugged in.
When being towed, there was a 275Amp (SB-275?) Anderson connector on the tongue intended to connect to corresponding on tow vehicle. Pretty sure this fed through a Renogy Charge Controller that was connected to batteries via 2awg as well as canbus. Inverter/charger also on same bus, as well as a monitor panel.
There have also been ROV trailers with similar systems. All charge direct off vehicle. No issues as far as I know. We just
Installed the high current cables direct to battery using a DPDT contactor. Renogy Charge controller maxed out at 50A, fused for 60 I think.
Thinking back, we did have an aftermarket setup come in. 4 banks of 48v LFP comprised of 4x100Ah, 800w solar, and this one used a DC-DC boost regulator whose output was 54-odd vdc with *VERY* heavy cable connection to tow vehicle. Think 2/0 heavy. And yes, there were 16 lfp 100ah batteries installed.. The new-to‐them owners were blowing alternator fuses often. We set the charge max to 60A, which gave around 15A effective charge rate to a bank, 1 at a time. Everything was Victron as far as Inverter, solar controller, DC-DC converter, etc. I would imagine original owner had a second alternator available, naybe a Neece unit as original charge rate was 180A (reset to 60).
