Looking to sell a tow-bar on Ebay.
Weighs about 20kg.

Box wouldnt be any bigger than say a bike frame size box, just heavy. Not going to be a lash up style box, can get it properly packed at work etc.

Cant seem to find a max weight on the website…?

Anyone ?

30kg you dunce.
Read the T's & C's.
Doh.

Usually 30kg with size being more of an issue cost wise

What are the maximum sizes and weights for parcels?
Each parcel must weigh no more that 30kg. Remember that someone at the other end has to be able to lift the thing when it is delivered! If you have more than 30kg to send, why not split this into more than one parcel. In terms of dimension, the longest side must be no more than 1.5m, and if you take the total measurement all the way round the thickest part of your parcel (we call this the girth) and add to the longest side, this must total no more than 3m.