Well, I ended up using the pancake compressor because it was putting out around 110-115psi whereas the larger tanked compressor only had around 100psi. The extra psi seemed to make a substantial difference in power. I could get about a 5-10 second burst out of the compressor until it weakened. I worked on one wheel. Most nuts took about 5 attempts to loosen. One took 10-12 attempts but all nuts on that wheel eventually loosed. I retightened them with my 40" breaker bar.
One set of rear duals had been off recently when I had a flat on the way home from NC about a month ago. Those immediately loosened with the 1" impact. Don't know if I could have loosened those by hand since I don't have long enough 3/4 extensions at the moment to reach inside the dual wheel.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13