The Sewer Solution is one product that works for a bit of uphill action but only if you have a good pressurized water supply. See
for a home made version
There are a couple of macerator pump kits that attach to a typical RV sewer fitting and they seem to work well. You need a good 12v
supply capable of ten amps or more for them.
There is also an article around somewhere (sorry, lost the link) about how to plumb your waste tanks for a permanently installed macerator pump. The key here is to use 3" to 1 1/2 asymetric reducers and to keep the pump accessible because on occasion you need to clean out the impeller.
And you need to be careful because this topic is ripe for an Aggie joke.
Been way too long since College Station days... remember 170' bonfires and an all corps student body?