2004/2005 Dynamax Isata

Good advice, Oldme. I'll do my best. Thanks!

Any Motor Home of any class and any motor vehicle can be overloaded.

Find out all the weights that the manufacturer lists of it and then search
what what they really mean.

Learn about:
That vehicles Hitch Weight
Dry Wt.
Payload = GVWR minus dry weight (literature)
GVWR Per sticker - Gross Vehicle Weight Rating
GCWR Per Sticker - Gross Combination Weight Rating

Tire ratings for YOUR vehicle so it is not overloading the tires.

Be safe.

Thank you Grumpy!! Great information. We probably shouldn't worry about the chassis, but I saw a comment on another forum about pre-2006 450s that said it might be too easy to overload the rear axle. And that's how this search for numbers got started!

For info, google up 2005 ford e-450 dual rear axel weight rating. You'll get the info you need for front and rear.
For a 2005 E-450 cutaway, dual rear wheel axel, it's 9450 lbs. Thats just the rear.
Grumpy

Wouldn't worry about it at all. We have a 2012 Forrest River Lexington 283TS on a Ford E-450 chassis and absolutly love it. We tow a Subaru and don't even know it's there. Rig is probably same size as the one your looking at. The 250 would be even less weight/size on the same chassis.
Neighbor has a 2005 Thor 4 Winds, 31' on the same E-450 chaqssis as the ones your looking at, again with no problems. There are thousands n thousands of class c and b+ motor homes built on the E-450.
Think about all the rescue vehicles, ambulances, and other commerical vehicles you see daily. Almost every one is on an E-450 or F-450 chassis. There's a reason--they hold up. When's the last time you saw such a vehicle on a Dodge or GM chassis? Probably during the last blue moon.
Grumpy