Absolutely would not trust a 3d printed part for this application, maybe low speed test drives in residential areas, but not parkway speeds.
I plan to get a fabricator to make it once I'm done tweaking it, on version 3 so far and still modeling options
just a follow up from AEONS ago... thought I should eat my words and admit that indeed I did trust the 3dprinted part at highway speeds....
After having printed solid infill for a move between states I left the 3dprinted solid brackets on #197 for my long drives.
After several test drives in blind faith that the bracket would work I found that there was no problem leaving them installed.
That was two years ago... and now I think the only reason they failed on my is because i over tightened the screw holding it down to the chassis....D'oH!!!
you can see the crack in the PLA where the bolt holds it to the chassis is splintered.... too much torque i think.
Then there is the case that
Both sides were still "intact" before i pulled them off #197.
I'll post the files i used if anyone would like them, just have to track down where i stored them first.