Heljan Class 11 500g hill start

Having watched the first film of the Heljan Class 11 a good friend asked if I had noted any degraded performance from the model when pulling a load up the grade, rather than pushing. The gradient is 3% using Woodland Scenics extruded foam sections, underneath a rigid shelf section.
It was a test I’d forgotten to do, so I quickly set up the test track to try the pulling test. This is a 100g lighter load than the first ‘push’ test as I hadn’t got access immediately to the additional wheel weights I normally use.
Over several runs the model showed no hesitation, and there appeared to be plenty in reserve, so I don’t anticipate there being a significant difference to it’s performance with an additional 100g load, if I were to replicate the original load.