Depending on your current offset, adding spacers at the rear will loosen up that end just a little. (mechnaically speaking, widening the rear end reduces the weight on those tires, tucking them in adds weight)
It'll roll just a wee bit more also (prolly not noticably if you don't really pay attention to that all the time) as it has the same effect as using a longer lever to pry against a weight.
The flip side is that you'll be less likely to tricycle the front tires as the back will be more apt to let loose first all together, or, if it does lift a wheel it'll likely be the inside rear. (due to the way the leverage works on the anti roll bar)
A fair example would be to try and find an overhead view of an F1 car. (being on the bleeding edge of what handling on road type surfaces is all about)
You'll note that the rear is set quite a bit narrower than the front. Especially if you compare the centerline of the rears to the fronts.
Wider is a more stable platform, but narrower is actually a bit better handling.
It'll roll just a wee bit more also (prolly not noticably if you don't really pay attention to that all the time) as it has the same effect as using a longer lever to pry against a weight.
The flip side is that you'll be less likely to tricycle the front tires as the back will be more apt to let loose first all together, or, if it does lift a wheel it'll likely be the inside rear. (due to the way the leverage works on the anti roll bar)
A fair example would be to try and find an overhead view of an F1 car. (being on the bleeding edge of what handling on road type surfaces is all about)
You'll note that the rear is set quite a bit narrower than the front. Especially if you compare the centerline of the rears to the fronts.
Wider is a more stable platform, but narrower is actually a bit better handling.