SCMIIW, but the RC kit just uses pucks to raise the vehicle?
Pucks or Blocks are NOT the way to raise a vehicle, at the same time, only 2" should NOT be much of a problem. The increased ground clearance and bigger wheels will give you some additional off road ability, but you've done nothing for suspension travel, it is the same as OEM for off road ability.
The drawback will be more stress on the steering and front drive shafts, I've seen enough posts, that NO they will NOT go bad right away, but eventually they may wear out sooner than stock ride height.
When you raise a vehicle, you often need to modify the bump stops as well so that the suspension bottoms out on the bump stops like it should and NOT the shocks or springs. It depends on the suspension, where its bump stops, but it can damage springs and shocks if the suspension bottoms out on anything other than the bump stops after you modify it.
Long shocks can help, at least in the rear, cause they will allow an increase in rebound. The front, I think you'll be limited by the IFS.
Bigger tires, will likely need wheel spacers to get them to clear, seen plenty of posts that Commanders are NOT suffering any ill effects of the wheel spacers, everyone is using 1" or less, other vehicles have had increased wear or failures from wheel spacers.
If you're dying to know what it will look like with stock tire/wheels, raised 2", you could always use a jack and some stands/blocks to raise the body 2" and just look at it for yourself.