Nice upgrade!
I created my own macerator out of a standard garbage disposal using this kit:
https://www.ebay.com/itm/SkySight-En...item2af26f7da2
I don't use it at the campground but have it in case I need to dump at home. I went this route because I read some reviews that these 12V models can sometimes overheat and have to stop and restart and the plastic fins to connect the sewer hose tend to break off over time.
Here are some videos of assembling the kit and then using it that I found.