DIY Alignment

I'm assuming you got the PVC on either side dead center of the axles and spindles?

Being a plumber for over 50 yrs , I haven`t seen very many pvc pipes that were perfectly straight , or didn`t take slightly bend/set after removing from a shipping bundle . Cant even lay them on the ground w/o some distortion , flexable in anything under 3'' , or schedule 80 too , even schedule 80 wont stay straight ...
think I`d have more faith in angle iron .