I'm with mtnbkr on this one. All the U-Hauls I see around here look to be in worse shape than the Budgets, and don't even compare to the Penskes.
I drove a U-Haul a couple of years ago McMinnville, OR to Albany, OR. Pretty rough truck, but it got me there.
I would not have wanted to make an earlier trip from Hillsboro, OR to Austin, TX in one. Drove a Budget (ex-Ryder) for that one. It was okay.
Drove a Penske from Colorado Springs to McMinnville, OR one year. Nice truck. More expensive, but the only thing available on short notice. It was in real good shape, drove well, and I had no worries about it.
Driving a U-Haul in three weeks from Albany, OR to Lebanon, OR. Only 15 miles, so I'm willing to risk it.