I wore out a set of canvas saddle panyards over a 30 year period. They work great for what you are looking for. Remember to get a lash cinch and manilla rope to tie the load to the horse and not to the saddle! I always liked a 3" metal ring and used that in making a modified box hitch...
I have a 14x16 wall tent that has spent many days in the Wyoming wind but it didn't take me long to throw my exterior frame away and build an internal frame. With the external frame it was a royal pain to try to keep the guy stakes in the ground. We often tied off to a corral or extra pickup...