For details on why you would unbond a generator, see this excellent video: https://www.youtube.com/watch?v=rhOmLIdoKNw
For details about whether or not you need a ground rod connected to your generator, check out this video:
https://www.youtube.com/watch?v=kXGs3QLF_sg
UL listed molded, lighted 30 amp generator cord:
https://www.amazon.com/gp/aw/d/B09CPDSVYB?psc=1&ref=ppx_pop_mob_b_asin_title