thanks signmaniac, i was thinking 6 feet, so 7 sounds good to me as well. The legs they wanted us to make are portable though, so they can take it to several sites.
How much are they offering to pay for this?
A 4x8 on a stand is no big deal. Don't know how you're going to charge for it but I'd be looking at about $300 for the stand alone if we make it out of wood (we'd use 6x6 posts for the base just for the weight)
The biggest problem they're going to face is that by the time you put your base on it's going to be so wide, and so heavy, that moving it across town to a new location is going to be ridiculously involved.
if the sled needs extra tiedown due to wind load, etc, just pound some 2' metal concrete form stakes into the ground and screw to the sled legs
In the past, the company I work for just laid sandbags down on the legs. This is my first time doing a sign like this, but the company I work for has done them before.
This is my first time doing a sign like this, but the company I work for has done them before.