Have any of you had experience with installing a "Tanks, Inc" tank from underneath? Today I removed my original tank after continuing fuel contamination problems...just plain nasty looking inside. Apparently a prior effort at sealing the tank had failed (would have been done in pre-ethanol-spiked gasoline days), with the result that there's now black goo and rust on every surface. The original came out easily, but I'm concerned about the reports that Bob Drake's tanks won't go in from underneath, and am unsure about that problem with other brands. Also, any experience with the plastic tanks? Any suggestions/thoughts?