A dolley or trailer present their own problems, mostly with storage. In the case of a dolley, loose straps and such are also often a problem.
4 down is easiest without question.
And cheapest.
But you cannot backup, not more than a few feet, and not if any turning is involved. The towbar will jam up, and you won't be able to release it, and life will suck for a while.
Pnne time, we were heading into a state park in Kentucky. I took the wrong turn in, heading for the beach. I didn't know that road did a circlke and headed back out....
I tried to do a u=turn, on a 180 degree turn road, in a place where a 40' DP with toad had no business even being (but if I'd continued forward I could have gotten out....)
Regardless, I ended up stuck. Towbar couldn't release, motorhome couldn't go forward or backwards, life sucked big time.
After a while, I did get the towbar to release, unhooked the toad, got the motorhome turned around, and got where I was going.
These experiences are the result of not knowing, or not paying attention. Avoidable. And not less of a problem that using a dolley or a trailer would have been in that same position.
Bottom line is, don't EVER go anywhere you are not certain you can get out of.