Why is it that people all of a sudden feel like you need to drive 80mph when you are towing? You know that 60,000lb load of food hauled in a 53' trailer? the truck pulling it sure as hell doesn't weigh 60,000lbs it weighs about 18,000lbs and they tow oversized loads with them. They are relative to their load VERY small vehicles but becasue they are properly outfitted and designed to tow safetly they do just fine. Bumper pull can be safe too. You ever seen a 70,000lb+ mobile home being moved by a 120" wheel base bumper pull truck? It happens everyday.
Funny thing my dad put over 2,000,000 miles towing 70-80klbs loads with a 425hp Volvo Semi truck that weighed about 17,000lbs. The internet seems to think that for me to tow my 5000lb load I need a truck that weighs minimum 9000lbs with >350hp....
I've put about 30k miles towing a 43' fithwheel weighing about 14,000lbs with a F250 and I NEVER felt "comfortable or relaxed". I had to drive it delibrately just like I would with any vehicle towing anything. I personally don't go by the school of thought that a properly loaded trailer is in any way something you think "isn't even there". Piloting any trailer vehicle combination is more dangerous. The margin of forgiveness may be higher with a F250 pulling a 3000lb boat but you still have nearly 11,000lbs that you are piloting down the road and need to think about that at all times.