Interesting and I must check our WnP for pitch circle, stud size & offset.. Prior to ordering this van I directly contacted Jayco and gave them the specs for the Ranger rims and asked if they would provide stub axle's of the same pattern and I would provide the rims and tyres. Answer initially was a NO, you get what we provide as standard. I've just checked some old emails and they did later on offer this "We are able to go to a 265/70R16 6 stud with a pcd of 139.7mm". They subsequently fitted 245/70R16 6 stud rims/tyres. Until this topic posting I hadn't bothered to check it out again. I believe that the Ranger is a pcd of 139.7, so on that basis unless the offset causes problems maybe they can be interchanged. Not possible for me to confirm for a couple of days but I certainly want to find out for sure.
Phil