I recently replaced the group 24's in my Itasca with two CG-2's. The only mod I had to do was replace the threaded hold-down rods with longer ones. Of course the wiring is a bit different for the series connection.
HTH, Fran
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Fran, Mary & Zoey (silver Cocker)
2006 Itasca Sunrise 35A, 2005 W-22, Allison 1000 5 speed
'13 Ford Focus ST or '10 Prius on Master Tow Dolly 80THD-SB or '00 Jeep Cherokee 4-down