GoPower was , maybe still is , using PowerMax as their converter supplier. Look for "max" in the GoPower name for it. PMX also supplies the ones known as "Boondocker". So you are where you started! :)
I hope the Honda 1000 will run a 45 amper at 14.6v as it is borderline. Try to be at sea level!
The 45 amper wants 9 amps--can't remember what a Honda 1000 will do
https://powermaxconverters.com/wp-content/uploads/2019/02/PM3-Spec-Sheet.pdfRats--the 1000 is for 8.3max and less for running. Still, you might find it works. Time2roll was right as usual.