The zucchini will stay put, it will just get big. The cukes sprawl and are best trellised as coarlb suggests. The squash can be trained. Use some stiff wire like fence wire and bend it into a U shaped staple, about 5-6" long. train the vine where you want it to go, and secure it in place with the wire staple, pinning the vine against the ground. Give it a bit of space to allow for growth/expansion. Keep training this way and you can pretty much make it go where ever you want.

I have a climbing hydrangea that was growing on a trellis in my back yard, and the trellis had to be replaced with a newer, heavier wood trellis at about the 10 -year mark. I had been attaching the emerging branches with twist tie through the years, and when it came time to take the old trellis down I just untied the twist ties and gently laid the vine down on the ground to one side, with some trimming and accidental breakage inevitably occurring. My CH had taken 7 years to bloom, so I was very careful with it and so were the landscapers who were ripping out my flimsy trellis and replacing it with the sturdier one. Needless to say, they were careful not to step on the resting vine while they worked, and yes there were a few accidents where some branches were lost. However, once the new trellis was completed we just re-tied the surviving branches in a nice spread out pattern (we did not remove the plant, just re-tied) and for the rest of the season it resumed life as if nothing had happened. I made sure it had sufficient water, kept an eye on tying newly emerging branches, and on the 2nd year now it looks like it's been there forever and I'm having to cut back again. They are quite resilient! I don't even always remember to fertilize, but that plant is going gangbusters again.

I would love to have some cross vine, snail vine, jasmine, and honeysuckle for trade or postage. Check out my list and let me know. I really want some cross vine. Cuttings would be best for me but will be willing to take seeds if possible. Thanks.

Hardy to USDA 4 is a significant limitation. L. japonica 'Halliana' is very fragrant and one book I have here says it goes down as far as Zone 4, but I've had it appear to freeze out in USDA 8! Another important factor will be what can succeed in your summer climate. And your soil - if you are down at the level of the arid valleys it is likely to be alkaline.