I purchased 3 trucks to rent out like UHAULS. Cost in 2021 was approx $100K. Can I depreciate those as an expense for my LLC business? Special rules? Type of depreciatio?

Started business in Q4 21. Income was less than $10K. Depreciation would be about $30K (1/3 of the $100K cost) on a 3 year life. First I want to make sure I'm allowed to depreciate. Second, if I can depreciate can I take full year depreciation even if I bought asset in Q4?