If you intend to use the vehicle for both personal and business purposes, you could still expense the cost but you would only be allowed to expense the portion associated with business use. The IRS makes it very clear that you cannot expense vehicle-related costs for a business if the vehicle is for personal purposes.
Given the nature of your business, I would not recommend purchasing the vehicle through the business. If you rarely use a vehicle for business purposes you would not qualify for the business deductions.
Good luck with the retail bead business and please let us know if you have any other tax questions.