Yep, the knock on the twin I beam mostly came from my years of reading Class C rv forums where the tendency to "bump steer" and wander was an oft noted concern, and repairs often were in the 2-3K range in order to alleviate the problems. With a simple cargo van it likely isn't an issue.
From the RV.net class C forum searched for "wandering"
Begin quote:
Posted: 05/18/17 02:54pm Link | Quote | Print | Notify Moderator
I drove my new rig home today, it was a 80 miles trip back home, I noticed that it felt like the front of the truck was wandering or it felt loose has anyone felt that in there class c and if so could you tell me how you fixed it.
j-d
Sunny Florida USA
Posted: 05/18/17 03:07pm Link
There are dozens of threads about this. There's good discussion in a recent thread with topic "swaybars" and another about being pushed around by trucks.
What Chassis is it on? Particularly if your chassis is Ford E350 or E450, the "80" you mentioned may be part of your answer.
Especially, again, with Ford, VERY important to inflate front tires to what a Weight-to-Pressure Chart calls for based on ACTUAL SCALE Weights. Load your RV up as you would for a trip, people and all. Get Thee to a Truckery (Truck Stop/Travel Cener) and weigh it on their CAT Scale. If you tow something, pull that up onto the scales too. People on board for the weighing!
Then go to the Air Station and adjust your tire pressures. Your sidewalls are going to be marked "80 PSI MAX" and they're pretty much fitted to your chassis with no excess capacity. So your Chassis label will also say "80" but that only applies to max rated axle loadings!
If somebody aired all six to 80, it's probably too much in front and your coach will wander, even if everything else is OK. Excess pressure in the rear tires...pretty much just makes it ride harder, but little effect on wandering.
Check all SIX tires. Look to see if there are flexible valve stems or extension tubes/adapters. You need Solid, One Piece Valves like These from BORG, also available at Camping World.
Posted: 05/18/17 03:34pm Link | Quote | Print | Notify Moderator
Wandering E450
End of that quote
There's also the interior room debate, an RV specific forum quote is below.
From the RV.Net class C forums:
[font=arial, helvetica, 'sans serif']Posted: 07/20/17 10:03pm
Link | Quote | Print | Notify Moderator[/font]
[font=arial, helvetica, 'sans serif']IAMICHABOD wrote:
The real difference between the two is comfort and driveability that the Chevy Chassis has over the Ford.
I don't know about the Chevy because it has been a long time since I drove a Chevy Express, but there is really only one thing that bothers me about my Ford E350. The gas and brake pedal are skewed to the left so much that I have to sit a bit skewed to align my right foot to them. I studied my seat and it is mounted properly in the right place. It's the pedals being too far left because the engine housing is so big. They are not in proper position to the steering wheel either. I have never read any comments about it. Am I the only one who finds that uncomfortable? I get used to it after the first few days of every trip. But every time I get in after a few weeks, I feel it all over again.[/font]
[font=arial, helvetica, 'sans serif']I found that one built on a Chevy Chassis as Ron noted, was so much better than the ones built on a Ford Chassis.[/font]
[font=arial, helvetica, 'sans serif']Here is what I found.[/font]
[font=arial, helvetica, 'sans serif']Length The Chevy is 9 inches longer.[/font]
[font=arial, helvetica, 'sans serif']But the real story is the interior.[/font] [font=arial, helvetica, 'sans serif']The area from the Dog House to the kick panel,the floor board where your feet are.[/font]
[font=arial, helvetica, 'sans serif']
The Chevy is 18 inches wide and mostly flat.[/font]
[font=arial, helvetica, 'sans serif']The Ford is 15 inches wide but has a 2 inch rise that is 5 inches wide leaving only 10 inches of flat floor. [/font][font=arial, helvetica, 'sans serif']With the seat pushed back as far as it goes on both the Ford And Chevy. Both having Stock Factory seats I [/font][font=arial, helvetica, 'sans serif']found:[/font]
[font=arial, helvetica, 'sans serif']Foot well depth to front of seat. Chevy 31 inches, Ford 27 inches[/font]
[font=arial, helvetica, 'sans serif']Seat back to steering wheel. Chevy 26 inches, Ford 23 inches[/font]
[font=arial, helvetica, 'sans serif']Front of seat to Dash. Chevy 29 inches, Ford 23 inches, 6" More leg room![/font]
[font=arial, helvetica, 'sans serif']Dog House width,measured at dash Chevy 15 inches, Ford 23 inches, 4 inches less knee room for passenger and driver.[/font]
[font=arial, helvetica, 'sans serif']Dog House depth into cab from dash Chevy 8 inches, Ford 11 inches[/font]
[font=arial, helvetica, 'sans serif']For long time driving comfort the Chevy has a better cockpit,smoother ride and is quieter. "[/font]
[font=arial, helvetica, 'sans serif']End of quote[/font]