I have been busy reading your posts and looking at your horse pics. I am astounded that so many of you are riding such BIG horses - 17 hh and upwards. I am in New Zealand and I do not know of one person (outside of serious eventing) who rides anything over 16 hh for general trail/hacking.
I really wanted a heavy horse but was not prpared to go over 15.3, I was fortunate to have scored my young mare. She is incredibly solid, I had to sell my old saddle and invest in a new western with a 9" gullet. Phoenny is nearly as wide as she is tall, LOL!
Anyway my question is what sort of terrain are you mostly riding your horses on? In our area it is very steep, rugged country. Our biggest problem is not the roughness but what our hills are made of. We have what is known here as Papa clay. Papa is grey and is a really good hard quite smooth surface when it is dry. However as soon as it rains it is turns to mud and man oh man does it get slippery! The hiils in my area are also really prone to slips (landslides) and it is not unusual to find the track you used one day covered by a slip the next day after a good rain. By the way I am in Taranaki and we get A LOT of rain. Generally most slips are not too big and you can ride a horse over them or worst case scenario lead on over, most slips are maybe 3mt wide and knee to belly deep on an average size horse.