I suspect that you might have two different versions of an lnb installed on your dishes. This might explain why the receiver, moved to the RV, initially only received 25% of the channels and ultimately stopped working. If this is the case, then obtaining a dish/lnb combination the same as at home...should alleviate the problem.
As per post #4 above, I would be cautious about declaring your intentions to Shaw or a dealer whom you do not know.
Shaw has no way to track where you are as long as you do not plug your receiver into a telephone line.