Just off the top of my head it sounds like the motorhome was bogging down on the soft soil. The engine was trying to overcome the dips it made into the ground to try and go up over the 1.5 inch concrete squares.
The engine was trying move six tires that were on soil so I think that was the cause of you needing to rock the coach.
MM.
Mr.Mark
2021.5 Pleasure Way Plateau FL Class-B on the Sprinter Chassis
2018 Mini Cooper Hardtop Coupe, 2 dr., 6-speed manual
(SOLD) 2015 Prevost Liberty Coach, 45 ft, 500 hp Volvo
(SOLD) 2008 Monaco Dynasty, 42 ft, 425 hp Cummins