On Thursday, August 10, 2017 at 8:14:41 PM UTC-4, Stormin' Norman wrote:
On Thu, 10 Aug 2017 16:18:32 -0700 (PDT), DerbyDad03
wrote:

I'm not looking to start another discussion related to the proper techniques for
jacking up and supporting a vehicle. That subject has been discussed ad nauseam.

My question is quite simple: Would you feel safe working under a vehicle that was
supported by either of these jack stands, assuming of course that you stayed
within the 2 ton rating of the device.

Based on the date that this first video was published, I think this is the newest
version of the RennStand.

Video Published on May 10, 2017
https://youtu.be/yqXIrSVQ3ts

The following appears to be an earlier version of the RennStand, based on the
date that the video was published:

Video Published on Oct 13, 2016
https://youtu.be/tfk5UF7rbuM

Maybe it's just me, but both the angled welds and the curved sections of the
support bars seem like dangerous points of failure.

The angled and curved pieces are types of arches. The load is easily
transferred through those structures to the abutments resting on the
ground. As long as the welds are created properly (can be said about
everything which is welded), the structure of the jack stands appears
quite sound.

I understand how arches work/transfer the load. It's not the arch shape that
bothers me, it's the welds. Since I didn't do the welds, I'm not sure I
want to trust my life to them when a "straight down to the ground" option
exists.

I'm sure they're fine, I just don't want to be worrying about them while I'm
under the vehicle.