No you do not have a Spartan chassis-- at least, I suspect you are on a Magnum chassis, as Safari (Safari Motorhome Corp) owned Harney.
They did a TERRIBLE job of weight distribution. Yes, moving weight forward is an excellent idea.
I have photos of a friend with a Safari who moved the generator from the drivers side "tail pipe" to just behind the passenger's front wheel. Made a big difference.
Ideally you want the same percent of GAWR on each axle. Suspect your front axle is substantially UNDERloaded. This will result in a rough ride, as there is insufficient weight to cause the springs to deflect. Said another way, the motion of every bump is transmitted directly to the chassis rather than being absorbed by springs and shocks.
Do you have air suspension or torsalastic?