I've been looking at that, but this cart was suggested in another thread and realistically it only costs like $10 more and if you're lazy it has high reviews in terms of quality:
http://www.amazon.com/gp/product/B00...A2GUMCXR7HBXM2
My question is, they use the same type of wheels (or very close). Are those sufficient to drag 80+ lbs across sand? That seems like the biggest area for difficulty.