As far as JUST the stretching is concerned, there is no negative effect as the stock/ original long wheel base is also with the same suspension and length to which i am extending it. But yes, if the height is increased with bigger tyres/ body lift or bigger shackles, the center of gravity will get effected. But not much, as from center the vehicle will only be lifted to a max of about 5" or 6" and not more. And to be honest if i am planning for a "GO ANYWHERE VEHICLE", than i should not be bothered about a little handling issues, that to only on turns with high speed only. My two cents.