On Thu, 21 Aug 2008 08:49:33 -0700 (PDT),
wrote:

Do I need to take the trailer to HD to get a new water heater or can I
lay the box on its side in the bed of my truck? I have a fiberglass
topper and the heater is too tall to stand up.

The boxes say "This side up" and whatnot, but it's a water heater...
I'd like to save gas and just get the heater on the way home instead
of making a special trip.

Walk around the carton. Look for "truck from this side"! :-))

Short answer: yes, haul it.