Receivers sometimes are difficult to switch back and forth between legacy and SWM. Yes, you can use one of the legacy ports off your SWM16 to switch it over. Hook it up, go into sat setup and select the type of dish you have at the lake, plus "multiswitch". You may have to do a reset on the receiver.
When you bring it back, reverse the process. Make sure you know what type of dish you have at home also (3 or 5 LNB).
When you bring it back, reverse the process. Make sure you know what type of dish you have at home also (3 or 5 LNB).