Keep in mind the 30205 has a 25mm bore and the L44643 has a 1" bore.....the most common (8" wheel) trailer bearing use to be the L44643 but I'm willing to bet the HF trailer has metric bearings. If you buy them other than a kit the 30205 will most likely come with the outer race but the L44643 has a couple of options size wise and are not usually included.
Don't buy a cheap bearing....get a Timken or NTN...something with a name on it.
Keith