The pickup versions of the F350 and F450 frames are 6.87 X 2.36 X .264 using the 2010 model year as an example. The cab & chassis versions are heavier in both cases...the F350 is 7.50 X 2.74 X .280 and the F450 is 7.50 X 2.74 X .320 up to .600 depend...
Another vote for the Lifeline 31xt's...125AH in the group 31 size battery...and fantastic charge acceptance. There are pricey but well worth the money.
Check out Stub Stewart State Park...off of highways 26/47 on the way over to the coast...about 35 miles west of Tigard. Not free...but better looking than a parking lot...and quieter too.
Most of the builders in my area are using rosewood oil for truck beds, trailer decks etc. I use it on my flat bed as well as the stakes and side boards. I think it gives a nice oil finish with a bit more UV protection than linseed.http://www.penofin....