can i run a deep cycle as an extra battery to help voltage???

[naughtyca 10+ year member]

1000 watts extra battery at back

1500 extra battery at back big 3

2000 extra battery at back big 3 ho alt

this is depending on how efficient your amp is

 

[argenis69 10+ year member]

in my opinion, i'll do the big 3 first before anything...