this rig is pushing it. a very experienced tow driver could probably do it with minimal risk.
I am a very experienced tow driver ( commercial semi drivers license, motorhomes and travel and utility trailers) and I would not drive it.
To be within specs, you need to stay under 7500# at the very maximum, 7000# would be better, and even then you will have to keep a close eye on your payload and tongue weight.