Iv'e had an advertisement pop up on a couple of sites lately.
http://www.caravancampingsales.com....e=Auto360&utm_content=banner&WT.seg_4=Auto360
If I read the description correctly it looks like a long range diesel fuel tank for the tow vehicle is mounted under the van. Didn't get whether it's actually connected to the car or just used for transfer while stopped. That or they use a lot of diesel for a van heater.
http://www.caravancampingsales.com....e=Auto360&utm_content=banner&WT.seg_4=Auto360
If I read the description correctly it looks like a long range diesel fuel tank for the tow vehicle is mounted under the van. Didn't get whether it's actually connected to the car or just used for transfer while stopped. That or they use a lot of diesel for a van heater.