A few things.
One. Are you saying the save-game fixer didn't work? Alright, I mean, It was a recent update, It worked splendidly for ores in the previous version, so I didn't expect it to have hiccups by the time it was posted to site. (The Horse one)
The Player Model reset one has been up there for a while, and should function.
You need to run these, btw, Launch them and they'll act out their deal - can't just download them, and if you can't just double click and launch their little applet window - There may be some other steps you can take to work around it, aside from setting up proper run paths so that the applet will double-click launch.
And Two
have you tried telling your horse to follow you and see if the carriage appears?
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To recap
Download save game fixers
make sure you're exited from game
Run save game fixer - and it will attempt to do its job - the Reset Horse and waggon version is really really new, I literally didn't see it before I started the post replying to you, and when I went to get the link, there it was.
Load up game - check results. - I suppose its possible there may also be some additional steps separating removing and reseting - which I might not know - Slip probably would, and I'm actually looking to ask for a different app or if they know how I can perform the task I want to perform. (I want to get rid of the about....... 42? less see 8 trees, 4-6 logs? 32 to 48? Yeah that sounds about right. - I wanna get rid of that many logs in my yard, cause for whatever reason, the trees duplicate when you cut them down and reload, and I'm worried I can't work through the logs fast enough and that the trees/logs that are duplicated will eventually cause lag.)