Yes, most people have no problem when you host their works but please ask the authors (which you can find the the readme file) for permission for each single files which is not your work.
In case you don't have permission then just put up a link to the place where the files can be downloaded.
It's no about special rules to make everything complicated but about respect for the creators of the works. They put a lot of time into building cars, tracks, mods, etc and they are offering it for free so please show some repect and contact them asking permission to host their files.
Then you will have no problems, your homepage will have a good reputation and more people will be happy
PLEASE consider this!