Having looked at bloodsong's Heavy Horse, and having been a horse owner most of my life, I'd go with the Charger and the add-on pack.  

Nothing against the Heavy Horse but it is a bit chesty and not as muscular in the hindquarters as most draft horses are.  The draft horses I've known and loved have been proportionate along the body from the chest to the haunch.  They're not slim, they're work animals and have the musculature to show it.

Can you post a link to the add-on?  I couldn't find it in her store here.  I'd love to see it.

Hugz from Phoenix, USA

Victoria

Remember, sometimes the dragon wins. Correction: MOST times.