>>2889371when you think a dolly on tracks would be cheaper and easier to extend than a slider, then you didn't think this through. i constructed both and the slider is the more practicable option. and my camera rig weights ca. 7kg, so for your (most likely lighter) rig a slider is definitively the way to go.
tracks are so complicated. remember that you have to level the ground and/or underlay a lot of sleepers (like 4-5 per meter), where every single one of them needs to be adjustable in height.
on the other hand you can construct easily a stable slider which only needs to be placed between two statives per 2 meters. you can install them even in a forest without any efford.
