SilverWook said:

And what the heck are the speeder bikes are doing there?

This is the answer posted further down in the thread:

micdavis said:

It took me 25 years to find out, but the speeder bikes were there simply because they were on the same trucks with the skiffs, from the manufacturers. So they stored them under the platform until they moved on to Crescent City, CA for the Endor scenes.

Is this the same guy who provided Jambe Davdar with the Super 8 footage in Returning to Jedi?