[phillyg]

I don't know about Hercules, they may be okay, but I know no one has ever complained about Sailun. You can use 85s if you have the space for another 1/2" (although someone on the forum will say your breaking the rules because your mfgrs. weight sticker "requires" 80s). Lastly, I've had every style of RV and never had accurate black tank gauges.