Yoda Looking good. Assuming you have the protection you mentioned between the trailer wiring and the power in bar you should be good. I would put your 400A fuse before the switch so it is protected by the fuse as well. I could be wrong but I think your fuses should be as close to the battery (power in bar in your case) as possible so there is as little unprotected as possible.
I did run a chassis ground from the inverter, but I do not think I did from the MPPT. You may find there is not one needed.
For the solar wiring I cut the cables from the panels and used the AM solar UV rated 10/2 solar wire. Based off this video. I had 3 sets of two panels in series, so I used on MC4 connector on each to make the series connection, and then converted to the round 10/2 for the rest. I can attest that the panels MC4 cable is super stiff and inflexible and the 10/2 is much easier to work with.
https://youtu.be/ZQ1DizeGkZM
I did run a chassis ground from the inverter, but I do not think I did from the MPPT. You may find there is not one needed.
For the solar wiring I cut the cables from the panels and used the AM solar UV rated 10/2 solar wire. Based off this video. I had 3 sets of two panels in series, so I used on MC4 connector on each to make the series connection, and then converted to the round 10/2 for the rest. I can attest that the panels MC4 cable is super stiff and inflexible and the 10/2 is much easier to work with.
https://youtu.be/ZQ1DizeGkZM
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