You have several options.
1) get a roller for the hitch. Camping World sells them. If you bottom out, the roller keeps you from getting stuck.
2) take the hill at an angle if possible. That helped in my 345.
3) I also used 2x6 planks under the tires in the valley. They doubled as my jack stands
The previously mention items are also very helpful. Your tanks are all behind the rear tires so draining them is a big deal (of course you need gas). I took my 345 to some pretty wild places. We called it Extreme Camping. We did hit Black Rock Mountain in Georgia up a 17% grade and around some sharp turns up to the HIGHEST camping pad. Alan, have you taken your 28 footer there yet?
Nice place. We laid in bed and watched the sunrise through the wrap around windows. Way cool.