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Problems will occur with the wheels leaning in. This will happen when overloading the car or if there are any mechanical or frame problems due to corrosion. Also I believe the car is only rated for driver and passenger weight totalling approximately 300/350lbs..
It was such a common problem in Canada that I had more than one owner think the wheels leaning in were a feature of the car and completely normal.

On the TR4A there is a support for the differential cross-member that fits down from the cross-member to the frame. Support for the frame section that the trailing arms are bolted to is limited by the need to be able to fit a driver in the car. The rear of the floor where the seat is located is of course right above the corner of the arm and the main frame.
This overall is OK if everything is in good condition and the car is not overloaded it works fine. But like any car or even the driver once things start getting old things don't work quite as well. Again this is supported well by the section fitted in between the differential cross-member and the frame.

You can note that there is now two sections to the frame that join at the area between the differential cross-member upright and where the outer frame joins the rear section.