Hi Mario,
It seems, the shorter the PC, the greater the need for suspension improvements. You have a 2910 and claim you don't have any handling issues so maybe you don't need them. But for short wheel base/long rear overhang units like the 2100 and 2350, the suspension upgrades are much appreciated.....most especially on the 2007 and older E350 model years because they don't have a Ford standard rear stabilizer bar like other E-series have.
Here are the listed upgrades most commonly utilized by owners of E350s and E450s, regardless of the brand of motor home.
1) Heavy Duty Rear Stabilizer Bar (thicker & stronger with polymer bushings, Helwig & Roadmaster are popular brands)
2) Heavy Duty Front Stabilizer Bar (thicker & stronger with polymer bushings, Helwig & Roadmaster are popular brands)
3) Heavy Duty Shock Absorbers (Bilstein and Koni-FSD are most recommended)
4) Heavy Duty Front Steering Stabilizer (Safe-T-Plus Is most popular)
5) Rear Trac Bar (Henderson is most popular)
I suggest you read
THIS and see if it applies to your PC.
Our 2007 2350 had serious handling issues when we bought it new 10 years ago. With my previous experience with the motor home it replaced, I wasn't going to wait, so I took our PC to our trusted RV/Bus/Ambulance suspension shop. They suggested everything I listed along with a proper wheel alignment. It cost me a lot, $3,900 ten years ago but well worth it. No regrets at all. I really enjoy driving our PC. And when conditions are horrid, I can still enjoy a cup of coffee and a bite to eat. I can drive so much longer due to less fatigue. My stops have been limited to potty breaks and/or gas...not because I am all worn out.