2013 F150 FX4 2'' wheel spacers good or bad?
 

I have purchased 2'' wheel spacers that are hub centric and have a wheel centric lip from the cjbargins store on ebay. They are made of 6061-T6 aircraft billet aluminum and come with 14x2 pressed-in heavy duty studs (grade 8 hardened steel). Before purchasing them I didn't do my homework because I am seeing a lot of stuff that deems them bad. I heard to get them torqued on and to drive 50km's and then torque the spacers again. Has anyone ran 2" spacers on their own truck? Any problems? I'm not worried about vibration because they are made specifically for my truck and are both hub centric and have the wheel centric lip to ensure they are centre. I am running stock 20's on them and the spacers are 6x135 to 6x135 same stock bolt pattern. I heard they put extra strain on the vehicles front end? Any input would be greatly appreciated!! Thanks for you're time.