I'm not sure how big your daughter is and what sort of weight they would have to carry, but my prefered tyres for my on-road buggy are Medial Pro Tarmac 2, they are not a usual thin wall tyre filled with foam, there made of tread rubber full depth hollowed out in a honeycomb lattice to keep the weight down and glued flat to the wheel to ensure no ballooning and minimal expansion, they are probably about half as stiff as solid rubber would be, I believe that the RC buggy wheel would be the weak point when you started loading it up.
the one on the left here is a 1/8th buggy tyre, 10th scale on the right.
Hot Bodies Lightning 2 Pro carbon, Mega 22/30/2, MMM, 4s3-5Ah.
Tamiya F201 carbon, Mamba 7700, MM, 2s A123 2.3ah.
Xray XT8, 1518, MMM, 4s5Ah.
Lots of boats.
fastelectrics.net