Been there done that with our 40 ft Itaska Ellipse. I talked with HWH and our jacks are more than capable. But I also don't like fully extended because it just doesn't seem right when their is an option. So, I made a pair of two 12 x 14 inch boards screwed together with a cut to fit rubber cargo strap on the end to pull free upon departure. Also carry two single boards for soft ground. The plastic leveling blocks then work well on top without sinking into soft ground. But, I also don't raise the rear wheels off the ground because of the parking brakes. Not worth the risk for me.
Hint. Drop the airbags first, then set the blocks. You will have space to remove the blocks without inflating the bags with travel mode.
Camco makes a nice adjustable step for situations like that.