The more you extend your leveling jacks, the less stable the RV will feel inside. This is especially true if you lift high enough to bring a wheel or two off the ground.
On the flipside, the less you extend the jacks (use more blocks), the more rock solid it will feel inside.
Next time before you deploy the jacks, try putting some large blocks under your jacks before extending them, so they don't have to extend as far. If you have to lift enough to take a tire off the ground, drive that tire, side up on blocks first to prevent such.
You may well find that using more blocks and raising the jacks less, results in a more stable RV inside. I have.
Tires help provide lateral stability when parked, so the more weight you keep on them when parked, the more stable, solid the RV will feel. Thats why its not a good idea to lift one off the ground unless absolutely necessary.
Yes, diesel pushers have an advantage when it comes to leveling, since they can dump air and bring the coach down very low before extending jacks to level. End result from this means that the coach sits lower, jacks not having to extend as far. Thats why they can be more stable when parked.
I've found over the years, that people frequently get very lazy when it comes to leveling, when they move up to a Motorhome. Its as if the leveling blocks they used for years without a problem with towable RVs, suddenly become something they just HATE to have to use. Don't be that way, haha. :)