Kangaroo APC

In 1944 the Canadian army was concerned about infantry losses and the inability to protect them while keeping up with other tanks, so they started to convert a number of unneeded tanks into an early version of what would eventually become the APC.

The earliest examples were Priests with their guns removed. After the Priests were returned to the US, Canadian forces tried the same theory with the chassis of some Rams, the Canadian manufactured version of the Sherman. This is what is in Bovington.

While it looks like you'd be well protected inside, having to all climb out through the top doesn't lead to the safest of deployments...