I've thought about the T-Boss 550 many times, just don't know anyone that owns a Massimo for reference. I see mixed reviews.
Your profile says Collin County, so if you want to save some money, the warehouse in Garland has disply units for sale on ebay.
Dynamic Carts in Carrollton has some 200 carts that might be better for the kids. Similar to a golf cart with rear seats that convert to flatbed. Electric versions too if you want a quiet machine.https://dynamiccarts.com/collections/gas-powered-carts/products/hulk-200-carbon-fiber