IW HB506 - Centre partition completely removed?

I have a 505 in which I have completely removed the partition and now only use a full length breast bar. I assume it will be the same in a 506.

If you intend to tow horses without a partition, may I recommend a breast bar for safety?
 
I have a 510, I have removed the centre partition completely, but I do use a breast bar when travelling my horse. I don't see why the 506 should be aby different. You really need a breast bar to give it stability AND to stop them bashing open the grooms door.
 
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