I'm going to sum up everything in my opinion.
First off, if you aquired a trailer you should pull the wheels, remove inspect the bearings, and clean out the unknown type of grease. For a few dollars a piece I would replace the seals with a double lip seal.
Then use your grease of choice rated for wheel bearing service. I choose Lucas Red "N" Tacky because it's good quality, Walmart sells it so it's easy to get, and the name is hard to forget so you'll always know what's in there and avoid mixing.
Follow up once a year or so with a pump or two from the mechanical grease gun or disassemble and re-pack.
After all, based on everything else Lippert does, do you really think they're using a quality wheel bearing grease? I think not.
*Current: 2005 Ford F350 Crew Cab Dually 6.0 diesel 4x4*
*Retired: 1987 F350 Crew Cab Dually 6.9 turbo diesel
2007 Forest River WildCat 32QBBS