I use the PAR trail friendly mountain-topper antenna that covers 20-30-40. I used to use the SOTAbeams 30’ fiberglass mast with it - and sometimes still do - but lately tend to toss a line over a nearby tree branch, so the antenna far end is usually no more than 15-20’ off the ground at the high point. I’ve found that a really short coax connection between the matchbox end and the KX3 has a higher than desirable SWR, but when I use 25’ of RG-174u I am fine. There’s probably some interaction between the coax and antenna causing this, but the bottom line is as the ads say: “It just works.” Plus, in many AZs, it has been very useful to have a 25’ feedline.
For 20 and 40, I usually don’t need to use the tuner unless the setup is really compromised, for example, in some AZs, I’ve just strung the antenna atop the high brush growth and gotten out. If I removed the shorting SMA male connector from the “center” insulator for 30M operation, I probably wouldn’t need the tuner there either; but often I am lazy ;-), or the insulator is not convenient to access, so I just use the tuner when I switch to 30M. Band changes with this antenna take seconds. If my tosses are decent, setup or take-down can take as little as 15 minutes.
To keep it simple, I’ve avoided any antennas that require more than one tie-off. Most of my activations have occurred during the winter months, so as you’ve noted, I want to make things as easy and fast as possible when the temps are low!
I will add a backup antenna along the lines of what N7RR has described…
73 Paula k9ir