"need to use barbellweights to stop stand falling over"

Funnily enough, you can make up some sandbags - of convenient weight to carry one or two at a time. Even dry sand, when inside a slighly mouldable bag, will have a lot of mass and inertia, and a couple around the base of a stand, even the 'open tripod base' type will add stability. The sand itself has the ability to absorb some vibration that may cause a stand to fall.