Well I also have an 03 Suburban setup for towing oil and tranny cooler etc. Being a Semi driver doubles and triples and everything in between. I think the main factor is how the TV and TT is setup. I run nothing in Grey and Black tanks and 1/3 a tank in freshwater. I run a 26 ft Heartland and load only essentials and make sure everything is working properly.
Everyone has an opinion but safety is a big thing with me. Speed is the biggest factor no matter what you use WD bars, sway etc wont help if you are speeding. I also instruct my girls to have a travel bag and do shopping at our destination. I also remove the third row seat which is pretty heavy. IMO it is road experience that causes some issues, trucks, wind, and weather. I think when people buy trailers they need some common sense advise. I wish I kept my Dually 94 it did not have tow haul mode which is a big plus. Or have a Diesel like my son has. I had to use a U Haul trailer and it had a classic on it and it did not have anything. Just used common sense it is the guy that flys by you and ends up in the ditch or causing a wreck.
1500s, 2500s and 1 tons or bigger have there place just do it in a safe manner and always ask questions. If my trailers were loaded wrong I would have them reloaded etc. Scales were my worst enemy if the trailers were sealed no fun, so load toungue heavier than rear of trailer and dont push it with tow vehicle. Sway mainly comes from misloading and weather but loading is critical IMO. If you travel in windy areas give lots of room patience is key better to get there than not. Suspension also comes into play my 4WD Suburban with auto ride sucked it sagged and then I added bags and then had to use the WD bars to look normal not safe took it EZ with that setup. Current Sub 2wd no issues did not use WD bars on previous trailer and tracked and pulled at speed. I think the previous post mentioned hook it all up and test it out good advice. Plus take the time to setup trailer brakes correctly that is a whole other issue. Be safe all