When I started flying Parowan Ut the tug there was a C150/150 hp.
The tow pilot was this skilled gentleman named Gene.
The Density altitude in the summer could go up to 8-9 K easy.
I launched my fully ballasted ASw 20 there with that tug many, many times.
Parowan is open ground , not much in the way of obstacles to clear.
I gave quite a few rides there with that tug in a L-13.
While it worked Ok and was cheap to run, it helped alot to have 2 skilled pilots on the rope.
Then a 600 HP biplane Ag Wagon thing showed up. Super expensive to run but very short time on tow with that thing. Unfortunate to report that plane was quickly balled up in short order.
Back to the C150/150. For years.
We also gave a couple thousand rides here in Telluride with a C150/180. Density here in the summer goes over 12k.
That plane was also cheap to run.
You can tow, on fairly low HP, just need some nerve once in a while if you launch into a sinker.
If you have obstacles to clear, that's a whole different situation than Parowan and Telluride.
Nick
T