Welcome to iRV2.
I'm currently flat towing a 2000 caravan( 12,000+ miles ) , with a Remco lube pump.
I've looked into upgrading the toad to 2011/12 and the info on flat tow from Remco is the same . Although the lube pump kit is different for the 4spd and 6sp transmissions. Set up cost ; lube pump, base plate and tow bar will run, approx. $3,000 , so you want to be sure she will be happy with the van for a while.
Edit : Note to self re-read all posts before responding. Your after dolly info. Sorry.