When on the road, I've used the jack from my tow vehicle. I ended up changing all four tires, one axel at a time, using the spare to hold one side on our last camping trip. Not recommended, especially if you are in sand.
If I'm working on the RV at home, I have the luxury of a heavy duty roller jack.
Last flat I got on the road, I used Good Sam Roadside Assistance to come out, and put the spare on. Priceless!
2013 V 3105
2016 F350 King Ranch CC 6.7 diesel dually