Water heater leak at PEX connection

Hi, group,
My problem is a leak at the hot water outlet on heater. I have replaced the rubber compression washer and can't seem to get the fitting to screw back on flush. I can hold tubing in place but when I release it the PEX tubing shifts a little and starts leaking again. Can I re-align the water heater to make it sit flushly?
Due to my husband's death in "05, I have not taken the camper on a trip. But I have a homeless friend I am letting stay in it temporarilly. I have considered by-passing the water heater as an option. My friend showers in my home. And when I do camp again, I prefer using the bathhouse- more room!

Any suggestions would be helpful.

1998 2720SL....