
I don't crate my big dogs at home, ever -never have done in all my years of keeping dogs. However I have never had a problem with them going happily into a crate at a show for instance, I think it is because it will smell right in a strange environment, and feels safe. I've twice had bitches never use a crate at all until the ages of 6 and 7, and that was still no problem. (In fact about 2 weeks ago at a show I crated one aged 2 ½ and on aged 7, both were fine, and it was their first time ever.) I bet though had I tried at home it would have been a different scenario altogether. So I don't think using one at home necessarily has any bearing at all on using one on holiday or similar.
Sounds more like your pup has a general problem with being left alone.