Large Dog Stroller / Pet Trailer / Pet Pram (Clerkenwell EC1R)

Looking for a large, sturdy pet stroller or pet trailer for a community project.
Ideally looking for:
    • Large breed model (around 50–60kg capacity)
    • Good working condition
    • Folding frame
    • Weather cover/canopy
    • Air tyres preferred but not essential
Models similar to Petique, InnoPet or Ibiyaya would be ideal, but I'm happy to consider other makes.
Can collect locally.
Many thanks!