Is your RV on a Ford or Workhorse chassis? It would also help if you show a photo of the mystery box. It could be an oil or transmission cooler, A/C condenser, etc. If it is a "radiator looking" device, it would probably work better if the fins were clean.
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Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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