If you're looking for an adhesive that stays put as long as you want it to, but will be fairly easy to remove when the time comes, my go-to is clear RTV silicone. Dries clear, holds well, and peels off pretty easy without removing paint when the time comes.
2015 XLR Hyperlite 30HFS5 (mods being performed regularly)
2009 Salem LA 292fkds (gone)
Nights- ('12)23 ('13)23 ('14)15 ('15)31 ('16)25
2014 Harley Davidson FLHX (XLR cargo)
2014 VW Jetta TDI (diesel sipper, camping support vehicle)
2011 Ram 2500 CC 4X4 CTD, B&W Companion (toy hauler hauler)