One of the things I appreciate most about RVing with a TT is the relative ease of self-repairs. Things tend to be smaller (which makes them easier to handle), and more standardized (which means less scavenging for repair parts).
Here's an example: Changing a flat tire.
Motorhome tires tend to be big, heavy, and secured with big, highly-torqued lug nuts. The nuts on my Class A required a 6 foot breaker bar to loosen or tighten to specs.
Having 19.5 inch tires meant that replacements were relatively scarce and expensive (and almost non-existent in Mexico).
Many of the automotive centers that cater to passenger vehicles don't stock them, and won't mount or balance them.
That's not much of an issue with travel trailer tires, and almost unheard of with tires on the pickups and SUVs commonly used as tow vehicles.