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Given some of the mentioned concerns, I decided to spend another 100 and get 4/0 welding cable. I appreciate everyone's insight. Thanks!

Right, treat the pair as one cable. Thanks!

I have 4 of these 135 ah batteries. Will be following this thread, and inquiring about getting the necessary parts, wiring, and software for external monitoring. All 4 of mine only had around 40 cycles, so I'm hoping these will last a long time.

Thanks for your recommendations. The Victron is a little pricey, but is a quality controller. I was considering getting 2 EPEver BN Mppt 40 amp controllers and using 2 strings of panels in parallel, 570 watts for each controller. Thoughts on using 2 controllers instead of one. This would save me...

I appreciate all comments. This is why I posted the question.

If I use two 2/0 battery interconnect cables together instead of one 4/0, would it be comparable in current capacity?

This is really good to know! I can save some money by using existing wire and pairing it up instead of buying more. Thanks!

I have 4 - 135ah 12 volt Valence lithium batteries and 6 Rich Solar 12 volt 190 watt mono panels. What are my options for connecting them in my Rockwood 2604ws travel trailer? Should I go All in One, separate components?, etc? I'm trying to purchase everything before end of year to get the fed...

I also have the Victron smart battery monitor

Inverter is purchased. Next is auto transfer box and PD lithium charger. Question: when running on the inverter and not shore power, how do I disable or bypass the charger? Do I somehow wire the charger to shore power in front of the transfer box?

Thanks for everyone's recommendations! There are so many options. I'm now trying to determine a few next steps. Inverter with or without transfer switch and charger, replacing existing WFCO charger with a lithium version, whether to charge from alternator while towing with a DC to DC charger...

Hmm, probably need a wiring diagram. So with this solution, I would manually disconnect the charger via sub-panel breaker? Can I separate the PD charger from the converter?

Now trying to decide on 3 panel wiring for each charge controller. Two strings of 3 panels in series or 3 panels in parallel, one 3 panel string going to each Mppt controller. I guess wire runs won't be too long on top the RV. I have 10, 8, and 6 guage wire.

I've decided to go with 2 EPEver BN 40 amp controllers. Will run 2 strings of panels. Now on to the inverter and transfer switch.