So, yes.....I vote for KILZ...oil based...if you can find it. Oh, I painted the floor too, as there was no way we were going to spend money on a floor that we are going to rip up eventually.
We also painted the kitchen floor in our old trailer,..we used some paint we bought at walmart,..it was a porch and floor paint,..man that was some good stuff!!! it was low odor and was water based it was pretty durable too.