Short answer of No, I would agree.
If you have the max tow rating for your Expy and keep trailer weight to only 8,000 it will tow but it will most likely be a horrible experience, especially with sway.
I towed a 9,000 pound, probably real world weight for your trailer loaded up, with a xcab f150 and it hated it, and they are more equipped for towing, especially payload on rear axle, than the Expy. Went to an xcab F-250 with V10 and was night and day. Towed it once with a friends 5.4 F-250 Crew Cab and it did okay especially around stability, but the engine was working hard.
From a safety stand point I would expect the Expy to come up short.