I’m continuing to build models representing the equipment from my first unit, 1st Bn. 2nd FA in Germany in the early 70’s. I’m considering adding a 5 Ton truck with the Fuel Pod dispensing unit from PSM. The TO&E from that period (along with my memory from closing in on 50 years!) shows that the prime mover also towed an M105 1/1/2 ton trailer with an additional 600 gal Fuel Pod, which PSM also makes.
I recall that when we refueled in the field, the two tanks on the prime mover contained diesel, and the pod mounted on the trailer (or at least ONE of the trailers, as the Battalion had two truck trailer combos on the TO&E) contained MOGAS. Given that we had 33 Mogas burning 1/4 tons plus the odd assortment of generators, compared to 101 diesel burning vehicles that seems to be about right.
Now with a 400 lb tank filled with 600 gal of gasoline at 6.3 lb per gallon, the payload comes out to almost 4200 lb which is of course greater than the 1 1/2 rating of the trailer.
I have seen various discussions indicating that the 3000 lb limit was for “off road” operation only and that the trailer could actually handle the 4200 easily on the highway. And I’ve also seen discussions that since we always had to be able to go off road, that to stay under the 3000 lb limit that the fuel pods were not filled to capacity.
Reading through the specs of the trailer, it appears that neither the axle, the wheels nor the tires would limit the Gross Axle Weight Rating to 3000 lb, so perhaps the 3000 lb was a conservative value due to the more harsh conditions of operating off road.
And of COURSE none of this matters when building a scale model.
EXCEPT the PSM M105 trailer model with fuel pod is equipped with Dual Wheels.
I have been unable to find any references that indicate that the M105 was ever fielded with Dual Wheels.
So the question to the forum is can anybody verify that the version PSM has with Dual wheels is correct?
I will certainly not rely on my memory to say I don’t recall seeing the trailers with the wheels outside the width of the trailer body, but it doesn’t seem to be correct.
Given that tires are almost ALWAYS the limiting factor in determining the GAWR of a vehicle, Dual wheels would certainly eliminate any concerns with overloading the trailer. The latest TM for the Pod which is from the 90’s shows mounting on a 5 Ton M1061 trailer which has Tandem wheels, effectively solving the problem in a different way.
SO is the PSM Dual Wheel version correct? And if so, is it perhaps a version which was introduced AFTER the period of the mid-70’s for the very purpose of making the fuel pod on the trailer less of an “problem”?