I meant more than 1/4 mile of sand pulling. In deep soft sand, my dolly wheels don't move much, and often bottoms out. On pavement or decking, you can load it up, and barely feels like pulling anything, until you go a little ways and need to switch hands. It is great for fishing piers. In that deep sand, those big balloon wheel carts are great. I'd definitely get one if I had a place close to the beach. We rented one, from a beach supply place when my kids were really small. Not the fishing ones, but same wheels. Loaded that thing up with the pack n play, tent, chairs, cooler, ect. Probably 150 lbs of junk, and felt like pushing a regular wheel barrow across a lawn.
I fish the Hatteras Point when there. Often the breeding birds have ORV access closed. It is a 2 mile walk from the closest parking spot. About 1/4 of that is on a "dirt" road (compacted sand with some gravel), if that is open. The rest is beach. I try to limit the soft sand from the end of the road at the dunes, to the wash area of the ocean. Which is usually 100-200 yards. Then pull along there. It does okay in that compacted sand. Still not fun for a mile or whatever. Just easier to pack down to "essentials" for that hike.
Those dune decks kill me, if there are steps. Pretty much 50/50 chance my entire dolly spills it's load if there are steps.