Including loose sand? Those small wheels look like they would dig in. Or cobble stones? Admittedly the latter is more of a European hazard.
That's why I got a cart with 10" pneumatic tires.
Cobblestones. You've never shot in the Meat Packing District.
Your probably not aware of what magliner offers and how many are in use in the film and photography biz.
Balloon tires for the beach, conversion wheels, umbrellas, 150mm mitchell camera mounts, monitor mounts, ditty bags, holds flags, lights, doubles as a tech station comes with umbrellas, shelves, drawers, stair climbers, folds down, can even be used as a camera dolly.
You can't find a set in Hollywood without a magliner, or a grip truck without two of them.
The junior when used as a digital tech cart will fit in most narrow locations, small hallways.
http://www.nalpak.com/retail/categoryGrid....C=C0242&N=1Film tools is just a good and most accessories are interchangeable.
http://www.filmtools.com/unacforallma.htmlYou can take my cameras, my lights, but not those magliners.
JR