You can generally tell by driving one if it was lifted right.
I want to say that most vehicles that have name brand parts are most likely going to be done right... But honestly there is a lot going on in correctly lifting a vehicle and keeping it so it handles and drives well. If you don't know , try to find someone to evaluate or really bone up on what to look for .
I hear the "is this rust ok" question a lot here .
I don't won't to offend anyone fighting rust , and hate that they have to deal with it in many areas .
If it's a serious amount of money , and you plan to keep it , .avoid rust completely. My brother is an auto body man ..when I was a kid , he showed me rust on a vehicle ..and said , see this ? It's cancer on a car. My brother is also in prison . So take it for what it's worth.
I understand wanting a Jeep , and wanting one so badly you want some rust to not be a problem .
The biggest reason to avoid it isn't money , it's so that you can enjoy your jeep and feel good about it . I hate to see a toy , or a gift you give yourself , or whatever you want to call it , be a headache for someone.
I mean in no way to offend anyone with a rust issue ,salted roads save lives, and I'm on a tangent here .
There is something to be said about build quality - and that something is knowing what to look for , and this forum helps .
I paid what I felt was top dollar , and then spent a lot because I didn't know the Jeep had a cheap lift , old tires , needed regearing and love. The only consolation I get is that I'm not throwing good money after bad .