Another Trucker Hitch vote. You can vary the tension, which seems to be the query.
The taut line is essentially a rolling hitch tied back on its own working end. It can be adjusted, if you pull, but will flex back, until the rolling hitch grabs.As you can with the taut-line and rolling hitches. The real advantage of the trucker's is that it provides additional mechanical advantage when you really want to cinch something down.
I'm not sure that I agree with you about being able to adjust the trucker's hitch easily.
There's considerable confusion over naming versions of this hitch; using Ashley reference numbers help clear the fog.If there is room I'd use a simplified trucker's hitch (slip knot for the loop), otherwise I'd use a rolling hitch (which I remember) or a taut-line hitch (similar but I have to look up).
----- Grog, at Rolling Hitch | How to tie the Rolling Hitch and Midshipman's Hitch | Boating Knotsgrog at animated knots said:Description: The Rolling Hitch Ashley Version 2 (ABOK # 1735, p 298) attaches a rope (usually smaller) to another (usually larger) when the line of pull is almost parallel. To attach a rope to a pole see Version 1 below.
Version 1: However, to secure a rope to a parallel pole, use Ashley's Version 1 (ABOK # 1734, p 298). There is no "tucked second turn". Both of the first two turns are just wound on tightly beside each other. Version 1 grips well on poles and bars but is less secure than Version 2 on rope.
Midshipman's, Taut-Line, and Rolling Hitches: A Midshipman's Hitch (ABOK # 1729, p 296) is created when a rope goes around an object and is then tied back to itself with a Rolling Hitch Version 2 – the version better for rope. This became known as a Taut-Line Hitch and was taught exactly this way in early versions of the Boy Scouts of America Handbooks. Unfortunately, a change was made and Version 1 was substituted – the version better for a pole. So now the "Taut-Line" Hitch being taught employs the less suitable version of the Rolling Hitch, the one better preferred for a pole.
Optimism: To end this confusion I live in hope that the Scouting organizations will abandon the Tautline Hitch and teach instead the better Midshipman's Hitch.