Some of the RV magazines might have a "best of" article...but no one will know your needs like you.
There are probably more expert opinions on iRV2 than in any magazine staff...so I say pick a model and ask here for opinions. Dolly users/owners are a loyal bunch and there are many different type dollies, so there are many questions you could ask.
Just do an internet search for tow dolly manufacturers to see some names, like Demco, Master Tow, Acme, Stehl, American, and Landgrieb. Dollies come with and without brakes (hope you get brakes) and with and without steering. They run from just over 400lb to over 1000lb and have a wide variety of GVWR.
I have an Acme Eze-tow because of its simplicity, low weight, price point, and ease of maint.
Kim and Steve, Mustang LCDR (Ret), '07 Damon Outlaw #1193
I have seen gross intolerance shown in support of tolerance, Samuel Coleridge
WE LOVE OUR OUTLAW RV