Edited because I missed something major:
I didn't notice at first, but I think you are asking about towing a 25 and not a 22.
bshillam":qn91x7l1 said:
I am looking at an E-250 to pull another C-Dory and wondering if it's enough Van to pull at 25.
Based on my experience (outlined below), I would say that would probably not work out well. I say that because on my rig there is no way I could have towed something around 8,000# and not been way over ratings. My 22 all-up is around 4,500# and that got me close on a few of the ratings. So adding 3,500# more would have put me way over. On the other hand, my van was a camper van and so it weighed around 7,600# (loaded) before I added the trailer. A fair bit of that was the camper outfitting itself, the rest was stuff/people. So maybe a stripped/cargo van could do it. One issue will be that the EB will cause your RAW (rear axle weight) to go up, due to the longer lever arm between the axle and the hitch (my new rig has a longer overhang so I had to calculate this and account for it before I decided to buy it).
If you just look at the tow rating, it looks like you could tow a house. But if you consider the other ratings that are necessary to meet (FAWR, RAWR, GVWR), then, at least for my rig, 5,000# was about my realistic tow limit. So there's no way I could have towed 3,000# more. I'll leave my original post below the asterisks just for the record, although at the time I wrote it I was thinking you were asking about a 22.
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My first tow rig for the 22 Cruiser was an E-250 camper van. It was an RB with the 5.4 V-8, so slightly different that way. E4OD transmission. It had around 100,000 miles on it when I bought it (but was well maintained and clean).
I found it to be an excellent tow (and camping) rig, and traveled over 10,000 miles with the C-Dory in tow, including plenty of mountain passes. Even with a friend and lots of gear aboard, we were comfortably under ratings (GAWR, GVWR, GCWR) (I weighed regularly at scales). 16-18 mpg on the highway not towing; 12.5 in town or towing. Never skipped a beat.
There are two main reasons I held out for a '97 or newer van:
1) OBD II and thus the ability to run a Scan Gauge II
2) Passenger side airbag
I moved on to a small Class C, but only because I'm spending a lot of time out and about. I still miss that van!