If you plan to move this receiver back and forth between the two locations, you want to be the same at both places. It is sometimes difficult to get a receiver to switch from SWM to "multiswitch" mode.
Also, just to be on the safe side here, I should point out that your terms of service do not permit having receivers/service simultaneously at two locations under a single account. The general feeling is if nobody is using DirecTV at home while you are using it at the cabin, you are at least meeting the spirit of the rule. You would be in violation of your terms of service if it was being used at both locations at the same time.