While a mobile mechanic is fully capable of performing a wheel alignment on your driveway, very few actually offer this service currently. More common tyre services include mobile tyre fitting and mobile wheel balancing.
Many can identify your need for a wheel alignment but, due to the need for specialist equipment that won’t fit in a van, they will usually recommend that you take your vehicle to a local garage.
There are plenty of garages listed on our comparison site which also offer mobile mechanic services. This may still give you the convenience you’re after as the technician can take the car back to their premises, complete the required work and then bring it back to you.