Just for reference, the "U-Haul" pan does not have increased fluid capacity...it's identical the the stock pan with the addition of the drain plug.
I was going to say that but I wasn't 100% sure. From what I remember, the reason the u-haul pan exists is because u-haul wanted to be able to easily service their vans. They have enough pull with Ford (and GM) thru their fleet accounts and large numbers of vehicles ordered that Ford complied with that request by simply modifying the standard pan and adding a drain plug. Probably costs Ford very little to do that and if it keeps a large national fleet company happy, it only makes sense for them to do so.
-Steve2006 Audi A6
~132k miles, stock.1998 Mercury Grand Marquis LS HPP
~100k miles, slowly acquiring modifications.1997 Town Car Cartier
~145k miles, Ported Plenum, Gutted Airbox, Contour E-fan Retrofit
, Dual exhaust with Magnaflows, cats deleted, MSD Ignition
, KYB Gas-A-Justs, P71 front bar
, air ride reinstated, Projector retrofit, Caddy 4-note horn retrofit, Wood rim steering wheel retrofit, holistic weight reduction as the parts fall off..1996 Mercury Grand Marquis GS
117,485mi. R.I.P. 7/14/12