Guild Wars 2

Two questions, really:

1. Is it possible for a day crew to pass on resources (in whatever form, supplies, upgrades, siege equipment, etc) for the night crew to be able to use during their “shift.”
2. If it is possible, can a dominating day crew pass off enough resources for a significantly weaker night crew to be able to hold out?

Siege equipment will once build remain available for anyone to use. It does have a 30 minute despawn timer, this can be rest by using the siege.
Supplies cannot be transferred from character to character, you need to make sure there is at least one camp you own, as capping one can be done a few players this should not be a problem.
When an upgrades is bought it stays one the object until it is captured. Just make sure your night team has the gold to buy upgrades.

With regards to a small night crew being able to hold out, that depends on skill and numbers. 5 people can typically hold a keep or tower against a larger group but holding two tower against two groups of ten becomes more difficult. It is typically more about spreading your resources and hold what is important.