Ben here (AKA BenK) and the only experience with vehicle weights are with mine and
when dealing with hiring a flat bed to haul my control room(s) to Mobil Chem in
NY State. Each control room was a 10 ga steel box about 10' tall x 10' wide and
about 40' long
Containing motor controls, computer controllers, etc for the plastic process
lines. Ranging from 500 hp controllers (heat sinks weighing in the hundreds of
pounds and that is just the SCR inverters), brake controllers, etc, etc
down to fractional HP controllers
These had 'wide load' cars in front and behind to convoy it back to NY State
The haulers taught me about psi on pavement, as our insurance agent was right
next to us talking to the trucker
As for folks on the street...closest is our ski lift controls. Not the mechanical's
but the controllers...including the motor and it's inverter/controller
Sand bags on each chair to simulate a body(s).
All fine, till they found out that folks would pay to go up there for both pictures
and MTB down hill during the summer. Issue was that all the sizing of the
controllers and sensors were for a temp range that went down to -20F and
during the summer over heated.
Or that when their mechanical's failed...our systems could and did
bend towers down to the ground after enough chairs stacked up against
it...all the while skidding on the cable...we found that the owner had
directed his maintenance staff to bypass our safeties as ours had
both torque sensing/limiting and de-rail sensors...all by-passed by
that owner and our insurance told their insurance...
We dropped that line after seeing/hearing of too many law suits and
silly awards based on 'current' safety rules/reg's vs when the equipment
was designed.
OSHA is involved heavily there and we also learned (got sued) by a death on
one of our early gondola controller systems. Weight was part of the metrics
to that death, but we were dropped from that suit after my insurance provided
our certification tests vs the spec we bid/designed to
On the robotic cranes we also had weight based specifications/performance
mandates. OSHA was also involved with the deaths there and we also had the
law suits against us dropped after our documentation/notes were submitted
Some of the largest in the world (at that time) rubber tired robotic cranes
(8 food dia tires) are also mine, or their controllers are. New Jersey port
and handled containers. Weight was a huge issue, as we put in strain gauges
on our motor/gear boxes. Foul they said when our stuff would not lift one of
their test loads during certification/acceptance testing. Once we showed them
their own specification...that we met...and offered to up the load ratings if
they issued a change order and we rebid (think $$$)
Yes, we did NOTHING other than to dial in the new spec to the computers. But
we also changed their service costs...as that shortened or reduced the design
margin for everything we provided. Mainly the gear boxes and brakes. Brakes as
they would NOT hold that new weight and we just added calipers and changed the
pad material.
Not automotive related, but I know OEM liability and how that system works
More so how insurance works...and...the buyout with NDA's that the public will
never hear of
So, yes for DOT/DMV it all about PSI to the pavement. But not so for the vehicle
OEMs...it shortens longevity and margin...therefore service costs. Then once
it gets down to a line on safety/performance, then legal will get involved to
allow or not allow.