Mack with a load

[28 Chrysler]

The rubber tires on the front must have helped the ride quality. Top speed I think was 19 MPH.

[auburnseeker]

I hope they didn't have to go over too many hills.  Doesn't look like enough truck to get up much less not get shoved down the other side.   Looks pretty hilly behind it. 

[nzcarnerd]

With only about 50 bhp from an engine of about 400-450 cid it probably needed to be quite low geared anyway.

 

I was reading some info re the WW2 era tank transporters, both British (Scammell Pioneer) and US (Federal etc). The Scammell had only about 100 bhp from a  six cylinder 8 litre Gardner diesel whereas the US models usually had about 200 hp from a big (600 plus cid)six cylinder gas engine. Both models had top speeds of less than 30 mph.

 

On the Wisconsin Historical site are all the records and specs books of International Harvester. I was researching their big D series models of the late 1930s which were popular here in NZ. The biggest tandem rear axle model had a 451 cid six cylinder gas engine making 120 hp at 2400 rpm. With the 9.00:1 rear end the max speed was just over 30 mph

[Spinneyhill]

Not much suspension travel available under the dozer, if any. The deck may even be on the wheels. The helper axle looks to have negative camber.