Your question is very brand, year and model specific. Consider posting this question in the Tiffin Owners Forum. On the iRV2 main page scroll about 1/2 way down and you will see the forum. I suggest this because nobody knows your coach like somebody who owns one just like yours.
2005 Newmar KSDP 3910 + GMC ENVOY XUV 37K lbs Moving Down The Road
The Avatar Is Many Times Around The USA
Nobody Knows Your Coach Like Somebody Who Owns One Just Like Yours