I don't think the 110 option was available for the diesel trucks, just a single 130, or dual 130's. One package I saw for mine was a single 140. I'll dig my book out when I get back from Cancun and start thinking about snow again...
iirc the single alternator config. was offered in a two different
levels 110a and 135a.
i dont know how you determine which one is installed.
there are all KINDS of options out there...and ive seen
some offerings into the 300a & 400a range (big bucks!)
heres one that addresses the issue specifically -->
Alternator upgrade for Ford 7.3L & 6.0L Power Stroke Diesel
high output alternator - Google Search
You need to remember that the plow is still an intermittent load, the batteries will absorb the rest. I have a 16,500 lb winch on the trailer that draws ALOT more than that, and it never is a problem, but I have a total of 3 good batteries in line (2 on the truck one on the trailer).
Are those alternators any good bushpilot?