I've used mobile home feeder before, but it was not rated for burial, conduit or not. I guess make sure you buy the right wire no matter what. 2-2-2-4 aluminum is good for 90A as a branch or 100A as a feeder.
If you pull through conduit, it will end up being separate wires with a W rating, which is easier to pull anyhow. Generally, bundled or jacketed stuff is for direct bury or in-wall only.