I think most Catrikes have a rider capacity of 275 lbs. I doubt that pulling a heavy trailer would change the trikes person hauling capabilities. Afterall any trail weight would be concentrated on just the rear wheel. That may need to be upgraded for a real heavy trailer.
Try checking the specs out at
www.hostelshoppe.com
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"The difference between genius and stupidity is that genius has its limits."
-- Albert Einstein