Welcome to the forum...can you elaborate more on your steering inputs? Are you "holding corse" or do you find that you need to provide input to counter wind, passing trucks, etc.? Does the unit had a slack spot at neutral (most noticable when on one side or the other of the crown in the road).
RV's definately have a different "feel" and require more attention and input than a car or large SUV. The frontal area, side area and size contribute to wind loads and weight shifts in a 18000# RV while turning are far greater than in a 4500# car.
Bascially, there is definately a difference the question is do you feel like something is abnormal. In a 05 you shouldn't have any serious wandering issue found in older units.
1986 Airstream 345 Classic Motorhome