Charge Lion Energy Trailer Batteries with Alternator?

[thatismytruck]

First post

Thank you Will, for the videos, website and forum. The videos and website have helped me quite a bit in deciding how I wanted to build my power system in my 1973 Airstream which I tow with a 2010 GMC pick up. I am basing my system on "The Classic 400W solar package w/alternator charging" from DIY Mobile. I plan to install in stages.
Stage 1
Install: two Lion Energy 105 aH batteries (Costco sale), Renogy 2000W Inverter Charger (amazon prime day purchase), Victron Energy Smart Shunt amazon primeday), cables, breakers/fuses, etc.
Stage 2
Purchase and Install: Renogy 30A DC DC charger, solar panels, assorted cabling breakers/fuses

My question comes on Stage 2: my trailer power lead from the truck alternator is pretty small. It will not carry 30A. But I'm not sure it will pull that if I have the solar connected. I like the idea of continuing to charge the trailer batteries with my truck like I used to when I was running with the Optima blue top.

I fear I am overthinking this. Can I make this set up work? The only time I see the "The Classic 400W solar package w/alternator charging" installed it is in a motor home and not a trailer.

Thanks in advance,
Skip

 

[A.Justice]

For 30a, you will most likely need to run a second set (or single, with appropriate chassis negative) of wires, and fuse, from your vehicle's battery, to the hitch area. Add a connector and run it next to the wiring for the lights.

 

[thatismytruck]

Thank you. I might skip the alternator charging then. Ill keep thinking on it.

Stage 1 nearly complete. Some install photos.
Installation is under my dinette benches. Photos show table removed. "Box" near the floor is where the trailer to truck cable comes in. I added a ground block there. After this photo, I added the circuit breakers, fuses and the victron smart shunt. Batteries are under left bench. Inverter/charger under the right.