Jeramy,
In case Gerald is busy,.... I believe that he added a Surge Guard to his coach along with an autoformer option so it did not come with one. I have a 2002 Marquis and that year also did not have one as an option or as a standard feature. If one was added to your coach by a prior owner, the most practical mounting place would be on the basement ceiling wired in just before the transfer switch. If a combo surge guard and transfer switch was ordered it would be in the same location replacing the current transfer switch...this option is not very likely.
Later Ed