The Station Wagon tire pressure specs have been lopsidedly-low on the fronts since at least 1966, that I know of. Station wagons, are closer to a 50/50 weight distribution f/r as the sedans are right at 55/45 f/r. The front tire pressure are always lower as the rear of the car is where the weight is carried, in the "factory specs" orientation.
On my '66 Newport CL42, I ran the tires at the specified pressures as that was what the factory recommended for 4 passenger loads. Later, when I took it to college, I had changed a few things. I'd become more educated on "understeer" and what caused it AND found a tire pressure/load chart in CAR LIFE magazine (one of their GREAT tech articles back then!).
Chryslers were more-neutral handling than Fords or GMs, back then, with the factory pressures. So, with the load charts for particular tire pressures (increments of 2psi between 24 and 32psi), I determined that "neutral handling" (i.e., front and rear slide at nearly the same time in max cornering mode) if the front tires saw the same relative load as the rear tires, in cornering. With the '66 Newport Town Sedan, the tire pressure needed for that was 30f/28rr, just the opposite of the factory sedan recommendation!
Basically, the "soft ride" spec was 24psi. If speeds above 75mph would happen, then "add 4psi". So, using 28psi as the starting spec for the rear tires, putting the fronts at 30psi would make the relative loads balanced, front to rear.
What this did was stiffen the front tires a little, increase handling response, and make the tires wear "flat" and extend tire life. Plus keeping the bias ply tread "more open" in wet conditions, wet traction was improved.
In the case of the wagon, the P235/75R-15 tires should have enough capacity at 32psi for most anything you wanted to do, much less 35psi (Load Range "B"). Upping the front inflation pressure will help steering response, but 32psi up front will increase ride harshness and steering "feel of the road". A lot of how things feel can relate to the brand of tires and how much tread depth is on them. So, play around and see what works best for you, using the rear tires as the base pressure you deal with.
OEM manufacturers like for "consumer" vehicles to have more "understeer" as when the tires squeal, the driver usually slows down in the corner. Too much speed in an understeering car means the car slides off the road "front first". In an "oversteering car", same speed in the same corner, it goes off "rear first" (spins out). Yet a car with a hint of understeer (whether by design, weight distribution bias toward the front, or tire pressure manipulation) is more fun to drive and somewhat safer in the correct "hands".
Whatever works best for what you seek to do.
CBODY67
