Hey Gareth:

No, it is not a Schrader type of fitting, but rather the normal PCL "Pull back" type quick release. For the loads that I carry on this and my previous trailer it has proved to be sufficient. I will look into the Schrader version though.

Since these photos had been taken, one of the additions has been a reworking of the three "U" bolt clamps on the draw bar and the addition of a security/breakaway cable that attaches to the seat post.

Thanks for the feedback.