Has anyone had any luck programming a new style GM remote for 2008 trucks? Additionally is there a flip style aftermarket key fob available that will work on an '08 H2?

 

for 2003-2007 the remote is the LHJ011. it would be printed on the back of your key fob so you need to find one that says compatible with that FCC ID.
as long as it is compatible with that ID it should not matter what car or truck they say it is for it would still work on our Hummer.

this one says 2003-2007 H2
there is also just the fob 2015 style
https://boostautoparts.com/products/...12843424055351 it would be the LHJ011 one
there are all sort of styles for them https://www.ebay.com/itm/STYLISH-FOL...-/132514567283