Brian - I am doing the same thing right now and believe it or not, blue painters tape is holding the plastic on my bus just fine! It varies from hot to rain here in a given week (77 and showers today, 90's this weekend) and the tape is holding up.Craig - MC7 Oregon
If you get the wrong kind of adhesive stuck to your bus you could be in for a lot of extra tedious work. The longer the tape stays on usually the worse it gets. To bad there is not some other way to do it. If your bus is steel could you use some type of magnets? Like the ones out of an old refrigerator door. I have no idea what I’m talking about, but I’m just throwing this out there. Good luck!
I finally ended up buying a huge tarp at Northern and a spool of poly rope which I used to tie the tarp around the bus. You can get more eyelets to install in the tarp, since they don't put very many in to begin with.