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Transformer is a separately derived source and the neutral x0 must be bonded to ground. I believe the nec also requires a ground rod as well. I dont think the generator contactor counts as a disconnecting means as described in the nec definitions

Remember to bond the transformer output

Winding primary/winding seccondary=voltage primary/ voltage secondary= current secondary/current primary A 3 phase transformer is just 3 single phase transformers in the same case. If you lower the primary voltage the secondary voltage will drop by the winding ratio. Some transformers are...

split between 2 panels, the risk of imbalance damage is minimal, the shared leg has a risk of overload. If fuel efficiency isn't a huge concern you can always use a heater to help balance. For example, Panel 1 is wired to AB panel 2 is wired to BC and the heater dummy load is wired to CA

balanced is more efficient, you can cause head damage by running 2 legs at their maximum and nothing on the 3rd leg. The short and skinny, Balance as close as you can but dont go nuts over a few amps.

If you are isolating the main breaker for each panel with an interlock there should be no problem. What can get you into some trouble is if the grounding and bonding is not done correctly, especially if for some reason you run 1 panel on generator and the other on utility. You also need to...