Well, O.K. if you insist on my 2 cents. May I sugest, to make the scene a little more interesting, mabe some sort of low wall, or an open door in the farmhouse, hiding some German troops, lying in wait to ambush the convoy? Not exactly the best thing for the soldiers (and completely upholing if your an american patriot) but, it happened all the time in WW II. If I understand from your recent post, it sounds like you want to model the truck as 1/2 empty (or full?) with equipment. That sounds good, but if my past knowledge of WWII serves right, then I beleave the Redball Express tried to squeeze every pound of capacity out of the Duce and a half trucks that came through, so I would recommend something like troops catching a ride to the next camp. I beleave that they would do that. Soldiers back then got rides by almost any means.
http://www.skylighters.org/redball/index.html a page on the Redball Express
http://www.jcs-group.com/military/war1941army/etoredball.html Some more information on the Redball express. Also has an offer on a book for sale if you are interested.
http://www.relics.org.uk/shop.php?viewcategory=108&phpsessid=a04f33f45ac5f92057679b52636fc943 A comertial website specializing in selling military crates. It should give you a ballpark idea on differant crate designs and colors. It's no fun to stare at all-wood color crates in the back of a truck. Also has other things for sale,too.
http://rallypointmilitaria.com/page/10 Another website selling WWII items. Also has useful refrence. This page has a C-Ration crate, if you can handle a brush good enough to give it a shot.
http://ima.usa.com One of my favorite military memorabilia websites. Specialises in wepon parts and tools, and clothing mainly, but it is still good for refrence. You can also get tech manuals, maps, flags, and (1/1 scale) Axis helmet stencils too.
http://www.serviceofsupply.com/ReproWWIIPaperItems.htm Another website specializing in replica WWII supplies. Mainly paper products like cardboard boxes and life insurance forms. Real interesting to look at those policies, I tell you.