I downloaded Memento and have worked with it just a little. It probably would work ok IF it is available for the IPad.
I also have downloaded HanDBase to my older Kindle Fire but not to my Droid Maxx yet. I like it but Memento may be able to do more creative things IF you can find the documentation explaining just what all you can do and how to do it.
One problem I have is the small keyboard for data entry but the keyboards for the IPad make them bearable.
Each of the programs have various templates available. I believe there are some vehicle maintenance template that should be easy to customize for your needs.