Just run, dude. People of this caliber are going to be your peers and maybe your managers. Dental distribution is dead and has been since practically Y2K. Doctors put their money into marketing and technology. Supplies and equipment are just expenses to slash.
PTO - there is none per say. Basically you take time of when needed and just let your RM know ahead of time.
Car allowance/mileage/gas - this is a set monthly allowance that will vary depending on your region and how costly the area is. Could be anywhere from $500-$1000 a month