"Stutch"...The reason you have macerating toilets is that neither of your toilets are located atop the black tank as in most RV's. Consequently, a macerator toilet is needed to grind the waste, add water and move it along a sewer pipe to the black tank. Yes, the end result is just brown water.
I think the Sewer Solution size hose will be plenty, but I believe they're pretty stiff. I would buy one of the hoses that is sold with the SaniCon system. It's a VERY flexible hose that extends to 20' and doesn't need to be flushed, if you leave the cap on the end of the hose.
SaniCon
