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They were local area refrigerated delivery trucks, typically operating within a 75-100 mile radius on typically 150-250 mile 8-10 hour per day delivery routes making 12 to 25 stops. Fuel economy as I recall was around 5 -6 mpg, though this including fueling the refrigeration units, not exactly comparable to typical RV use. As I recall the only difference between the 4700 and 4900 was the weight rating the 4700 was offered as a 25,999 GVWR to be a non-CDL chassis and the 4900 was the over 26,000 CDL required chassis, with the primary difference being the rear suspension, though their may be other details. All of ours had air brakes, but I think hydraulic brakes, and automatic transmissions were available. There is a lot of variation in these trucks even in ones of the same model year, at one point we had a 1999 4700 with a bad engine which we started to salvage for parts for the other 1999 4700 we had at the time and found many parts would not interchange, I am talking about stuff like the ignition key switch, stuff you would think would be standardized. Number of starting batteries was another common variation, they might have from 1 to 3 group 31? (maybe group 29) starting batteries as wired from the factory, with most having 2 or 3. On a side point the 4700 (and possibly the 4900) was available with both low and high profile wheels, all our were the high profile, the low profile sit much lower to the ground, sorry I don't recall the sizes, though I think the ones we had used 22.5 inch wheels, which means the low profile probably used 19.5 inch.
Ike
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2002 Safari Trek 2830 on P32 Chassis with 8.1L w/ 400 watts solar 420Ah LiFePo4
2017 Jeep Cherokee Overland & 2007 Toyota Yaris TOADs with Even Brake,
Demco Commander tow bar and Blue Ox / Roadmaster base plates
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