The sidewall maximum inflation is intended for cold inflation, not hot.
So, inflate to 50 psi if you that is correct for your load.  Make no
adjustment when the tires have been driven.  Yes, the psi will be higher
than at cold inflation, but it will not exceed capacity (unless the van is
overloaded or driven at speeds in excess of the speed rating of the tires,
or the inflation was incorrect for the load).  For my van, the recommended
psi (door placard, owner's manual) is 53 psi rear, 43 psi front.  I make
sure my  tires have a sidewall maximum inflation pressure above those
values (typically, 65 psi).  I inflate to 43 and 53 psi, regardless of
initial conditions.  I periodically check the inflation psi.  If it is
higher than those values after driving, I ignore that.  If it is higher
when the vehicle has been setting for one hour or more in the shade, I may
drop it to the stated values.  If it is lower, I raise it.  Typically, I
measure the pressure when the vehicle has been parked overnight, adjust it
to 43 and 53 psi front and rear.  After driving, no adjustment.

mcneely

On Fri, Jan 11, 2019 at 12:01 PM Dan N <dn92610@gmail.com> wrote:

> I put 42 Front and 46 Rear on my vans.
>
> 50 is too much since the max. on sidewall is 50, if you put 50psi then
> there's no room left for expansion when the tires get hot.
>