I figure if someone can't see a big 30 foot, 7 ton box towing a car, then daytime running lights really won't matter.
As for "fogs", most factory fogs aren't worth spit. Get yourself a good pair of Hella's. Pricey, but the best you can get.
Grumpy
Canadian versions of the E-450,or any model for that matter, has Day time Running Lights, if you go to your Ford dealer you can buy the DRL module and install it yourself.The dealer can show you where to plug it into the harness.