I've had retractable, never again. It's a pain keeping the tow bar in decent condition. Prefer removable, they are easy to fit.
There was another thread on here recently about rear crash bars and tow bars. Some aftermarket towbars retain the bumper crash bar internals, some don't. I would suggest retaining it is the better option.
Good advice on hitch weight, this is critical, and with a mini digger very tricky to get right as a small change in position will make a big difference. Twin axle trailers are way more stable than single axle, but more difficult to manoeuvre off the car (wind hitch up high to reduce weight on front axle when off car). The hitch weight is number one thing for towing stability, not too high or too low. 90kg on a D5 from memory, 7% of trailer/load mass is ideal/guide, but tow bar max is as high as you can go.
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