tinovack, I moved your post to "Parts Wanted".
You should be able to use any 12V DC powered RV water pump in your trailer. I'm pretty sure mine is a Shurflo pump and Amazon has that brand and others as shown here: https://www.amazon.com/s?k=rv+water+...l_3lpa9ff8js_e
You could also check etrailer.com: https://www.etrailer.com/dept-pg-RV_...BoCvzkQAvD_BwE
I'd just choose the one that "appeals" to me. Quiet operation is something I'd like if I was replacing mine - the OEM pump is quite noisy in my opinion. I think you'd want something that delivers at least 3 gal/min.