Wow...a symbiotic (or, at least cooperative) drafting relationship. Now if I could be assured of that, I'd draft closer (like Xcel...if that DVD is ever released, you'll see just what 'brave' is...
Problem is, unless you're doing a close-in draft, you don't gain that much, IMO. I followed a double-tandem for a good 20mi a few weeks ago - he was driving w/ load at about 62mph from what I remember (?) But when I finished with him, and looked down at my trip FCD, it really wasn't too much / any (?) higher than if I had been breaking the wind resistance myself (had to get 'resistance' or *some* word in there...
So I don't actively search for trucks, but I'll get behind one that looks good, and try my luck. At a somewhat safe distance

About the only time I'm close to anyone in front of me these days...
