Aluminium ramp width, for 3.5 ton excavator?

I'm buying some new ramps very soon, maybe even tomorrow.

My excavators rubber tracks are 300mm(12 inch) wide. My two ramp choices are:

One that's 350mm(14inch) internal. weighs 33kg(73lb)
The other 400mm(16inch) internal. weighs 38kg(84lb)

I want to get the lightest one because of my back, but do you guys think it would be annoying trying to line up the ramp narrow ramp?

What do you guys prefer?

Aluminium ramp width, for 3.5 ton excavator?