No direct experience with a long horizontal run, but my suspicion is it would not work with the very small amount of water used to "flush" an rv toilet, it really only works because it drops straight down. A home toilet uses a ton of water to flush everything down the pipe runs. My suspicion is you would just have constant plugs in the horizontal pipe.
Is it possible to do something creative like a small tank under the toilet and a macerator pump through a smaller pipe to your black tank? I know a lot of campers that have two bathrooms use an arrangement like that to empty the rear tank into the main tank so as to be able to dump all tanks through a single dump valve. You could also check blizzardnd's build thread, it seems to me he used a macerator pump setup on his rig.
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