Mobile field shelter on wheels - where can I get one?

[Katla]

I have googled but can only find ones that are on sledges/skids or are basically static but you can move around. I remember seeing some that were like a trailer that you could lower down but I can't find them anymore. Can anyone help? Thanks :)

Apparently redmire do one called the eagle . I think . Will ask my neighbour where she got hers from .

That would be great. Thanks!