Good news! And congratulations on being the selected installer. Sean thoroughly does his due diligence - kudos to you.
We saw Sean & Kristy in October 2019 in Gros Ventre / Grand Tetons NP. A really cool couple! I have always wondered why they did not have solar.
We have 900W (9 panels) with 600AH of lithium cells on our 30' Classic - love it! Can run one of the AC units for a decent period of time via batteries. Rarely use the generator for any purpose!
Looking forward to seeing your progress via Sean's video. Best wishes.