If your ride is so hard are you sure you are not slavishly following the stupidly high tyre pressures the manufacturers often quote. Get you van weighed and then consult your tyre manufacturer's pressure recommendations and it will make a big difference.I'm sensing a bit of a split in opinion here. Haha.
If the difference wasnt so bad I probably wouldn't be concerned but the last place we camped at I couldn't get it level with the ramps, I had to resort to doubling the ramps on one side and using the scissor jack on the other. Plus the ride is so hard