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Hi Guyd I have a similar shaped brick only smaller. It is an all alluminium kurbmaster camper with a 6cyl 292 petrol engine. So far I have installed a camback, a partial boat tail if you can call it that, wings down the sides at the back about 150mm angled in at 15% forming a box shape, a grill block, a small air dam, fender skirts.I have found no noticeble improvement in mpg after testing for around 1000 kms I am still on or around 16 mpg (imp) there has been improvement in the stability of the van and I find myself driving 10% faster. I am in the process of installing a full belly pan and skirts down the side which I have not tested as of yet as it is not quite finished. I plan on changing the front bumper and scooping the air under in a smoother fashion. From my experience so far, I have a feeling that my gains will be minimum. I also plan on replacing the clutch fan for an electric one and removing the air polution pump this is where I think I will see some gains. All these aeros have made it quieter and nicer to drive but have done little so far to improve my fuel economy. I think you are looking in the right direction focusing on the engine and drive train. someone pointed me to a TExas study that said by installing a 140mm radius above the windshield on busses like yours would reduce drag substantially, how that will reflect on you fe with your roof is anyones guess. Good luck
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