I'd do it, as long as the GPS was tethered so it didn't hit the ground when it fell off.
I have the same paranoia with my GoPro's..... last time I used a suction cup it was also gaffer taped to the metal body with a lot of tape, plus a tether.
If the base gets sun on it, I've found they tend to fail after time.
I just got back from a 2,000 mile trip earlier this week. I have four GPS devices, but took my TomTom Via this time, mounted using the suction disk. It never came lose, but I did tether it just in case.
Regarding the GoPro, the suction unit for that camera is so strong you can use it to pull dents out of auto body panels. It has never come lose on me.
I tried the suction mount on my 05LT. I had a Garmin Street Pilot mounted on the flat spot near the BMW badge on the "tank". It did come off a couple of times. Once I nearly lost the whole darn thing. I finally used the adhesive mount but used black silicone instead of the adhesive. It lasted a couple of years and about 50K miles and never had a problem with weather or temperature. Nice thing was I could remove it without damaging the paint.
I've used my suction cup several times without a problem, until 2 weeks ago when my bike was on the driveway and the cup let loose. There was no damage, so I ordered a GPS mounting bracket for my Bags Connection tankbag and a RAM cradle. I haven't received either yet, but I shouldn't have to use the suction cup again.
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