what issues would you see if I use the stake hole behind the cab? with interferance, feedback or ?tuning ?
Well, using my Dodge pickup's stake hole locations as a guide. Mounting a Little Tarheel II in that
spot would put it very close to the cab and would create tuning problems. Ideally, the antenna should be mounted in a way that the coil is above the roof of the cab. Baring that, having it as far
away as practical, will make tuning it easier, and improve your signal as well.
Do some reading on Alan's website and you will get a better feel on what you need to do. You may have to make some compromises but, you can minimize them by following Alan's suggestions as much as practical in your situation.
A little time spent on details will pay off in the long run. (bonding etc.)
Edit, I guess I could have read your post a bit better and said, ALL of the above!
All the issues you mentioned could easily become a problem with the antenna mounted
that close to the cab.