For those who might come upon this thread later, you cannot simply change out LNB's and add a power inserter to make the SK-3005 SWM compatible and doing so could cause unnecessary damage.
All that is necessary to use the SK-3005 with DirecTV SWM hardware is to add the SWM8 hardware. This involves the SWM8 switch being mounted beside the Trav'ler base and connecting one of the existing coax runs to a power inserter. Now one single cable to each receiver will power all tuners in the box.
More information about setting up the Winegard products for DirecTV's SWM receivers can be found here:
http://www.winegard.com/kbase/upload/2452242.pdfAdditionally, the "new" Trav'ler for DirecTV has the SWM technology built-in and can be used with all of the DirecTV HD receivers without any additional hardware. A new product number replaces the SK-3005 with the SK-SWM3.