roll bar for 71k5?

[hwc71k5]

Looking into roll bars for my 71. Mostly city. Do I need frame welded or is body welded enough?

 

[Silver84k5]

what does mostly city mean?
Minimal offroad?

 

[hwc71k5]

ill probably just be driving it around the city. maybe some offroading now and then if i can get the money to fix it up.