The three wheel heavy duty trailers are what you need if you really want a heavy load of up to 150 kg as the third wheel keeps everything nice and stable and towing smoothly. Heavier loads than this become dangerous on hills and for emergency stops.
They are all custom built and use a seat post hitches so they make a great hand cart when its not being towed by your bike. Aluminium bins are made by a local sheet metal worker and typically cost $600 for a large size. You can make your own from plywood or Agpac Tuffboard (recycled plastic) which is a little heavier but likely cheaper. If you need a large bin couriered it can be made to bolt together for an extra $100 or get a local sheet metal worker to make one for you.
Wheels generally need to be stronger than the average bike wheel so 26" 20mm thru axle MTB wheels, or 20" 14mm axle BMX wheels are good options
Cost is typically $1600 for a 1600 x 600 mm load space
The worlds biggest bike trailer 4m long by 1.075m wide load space (fact checking welcome)