SER cable Through Crawl Space (encapsulated)
I would simply run it attached to the side of the joist
I would simply attach your run to the side of the joist so that it's set back upwards of 1¼&quot; from the joist edge (to avoid the need for a nailplate).  Attaching it to the joist can be done with straps or staples designed for 4/0 SER cable (note that SEU cable staples/straps are not usable for SER cable as the two are shaped differently).