Eric,
They did make Patriot Savannah's with side radiators. On my coach the vents are there at the left rear with only the transmission cooler behind them. I don't know what all my coach has been through in its life so it may have had some modifications. According to Dave Atherton my engine was a replacement one so he can't tell me much about it. I know that most things were left stock, but I do have a extra pair of shocks up front. Fortunately the wiring harness seems to have been unmolested. I guess that it is possible the replacement engine had a radiator change. Mine is reported to be the 330 hp version, but who knows. I know that it is a much peppier coach when it is not towing, and the temps are lower too.