Welcome to the forum!
As I recall, spacers on the RTV aren't a favorite item. Because of the RTV's weight and hauling capacity, there's concerns about axle, bearing, lug... load issues by taking that much weight and spreading it out farther.
The center-of-gravity is pretty low on the RTV. Do you have tipping concerns?
Also, when pushed out on the front, you may encounter rubbing on the fenders.