1. User(can have both or either one)
  user can have one trucker
  user can have one owner_trucker

2. Trucker
  belongs to user
3. OwnerTrucker
  belongs to user

helper_method :profile_type_from_user
  def profile_type_from_user(user)
    return profile = user.trucker ? :trucker : :owner_trucker
  end

if profile_type_from_user(profile) == :trucker
else
end

@profile = current_user.trucker ? current_user.trucker : current_user.owner_trucker

current_user.trucker? && current_user.owner_trucker.nil?

helper_method :profile_type_from_user
  def profile_type_from_user(user)
    return profile = user.trucker ? :trucker : :owner_trucker
  end

class User
  ...
  def profile_type
    trucker ? :trucker : :owner_trucker
  end
  ...
end

@profile = current_user.trucker ? current_user.trucker : current_user.owner_trucker

class User
  ...
  def profile
    trucker || owner_trucker
  end
  ...
end

@profile = current_user.profile