There are many saddle options now that have adjustable trees. Since you will be riding many different horses and maybe one day will get your own this is something that you could look into. I don’t know your price point or what saddles fit you, but there are inexpensive synthetics like a Wintec and there are leather options like Pessoa, Circuit, Bates, Ovation and Collegiate. You will have see what fits best both your body and budget. Happy shopping!