can the bottom be collapsed with the upper basket full, so it can just be loaded into car without emptying the cube?

You can detach the cube/box very easily and then fold up the cart. It is very handy. You could also just put the cube in a regular shopping cart and use the cart when you get home. You can buy an extra cube to use on the bottom too. Lots of options. I love my cart.

What is the turning radius of the front wheels?

Turning radius? Not exactly sure what you mean, but the wheels are "free" wheeling. They will turn however much you turn them. Maybe with a heavy load, turning may not be as easy, but you can spin them around easily in a grocery aisle. Handling and maneuverability has never been a problem for me.

Manufacturer	CLAX
Model Number	grey
Package Dimensions	68 x 48.5 x 18 cm
Material	アルミニウムアクリロニトリルブタジエンスチレン（ABS）
Color	グレー
Special Features	軽量, コラプシブル, コンパクト, 折り畳み式
Package Weight	9.54 Kilograms
Batteries Required	No
Batteries Included	No
Brand Name	Clax
Item Weight	6.9 Kilograms

CLAX® 多目的機能折りたたみ式カート | モバイル折りたたみ式トロリー | ショッピングカート 収納クレート付き | プラットフォームトラック (グレー)

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CLAX® 多目的機能折りたたみ式カート | モバイル折りたたみ式トロリー | ショッピングカート収納クレート付き | プラットフォームトラック (グレー)