I can't help you with your leveling jacks problem. However, you might look into having the caster set to 5°-6°. This has helped many W series chassis that had a straight line steering vagueness.
to read a IRV2 thread about caster.
The thread mentioned above shows how 3 members of IRV2 have changed the caster on their motorhomes with positive results. I have a W20, CamJam has a W22 and Harley has a W24. Adding 3° shims helped remove steering vagueness (wander) all three chassis types.
Changing the "toe" adjustment on your motorhome may not have any affect on the steering wander issue.