The wire I was looking at is :
https://www.wireandcableyourway.com/4-0-4-0-2-0-4-aluminum-mobile-home-feeder-cable.html
rated as:
Applicable Standards:
Ampacities based on National Electric Code, 2005n edition, section 310-15
UL 44 for types RHH & RHW-2
UL 854 for type USE-2