We have a 2007 Ridgeline RTX with the towing package installed. We are looking at buying a travel trailer that has an unloaded weight of 4,300 lbs. It is a dual axle trailer and we are having electric brake controller installed plus anti sway and stabilizer bars. I believe the towing package comes with transmission cooler. I know the GVWR is 5,000 lbs but I might exceed this a little when we put gear and stuff in. Should I be too concerned?

No, this shouldn't be a problem as it is a limit set extra low so that you would take precautions and wouldn't put too much over than that. It is kind of like when a computer desk says the max is 50lbs but it can actually hold 150lbs, that way the supplier isn't responsible for any damages or losses if it breaks.

Ive towed a car and a bobcat before with one. handled nice, alil sag in the rear. but im looking onto fixing that.

The only thing you might notice is uphill it might go slow but I doubt that will even happen anymore than it normally would.