Hi,
In short, what you're attempting to do can be very costly if you stick with the Adobe LiveCycle ES solution to render forms on mobile devices (via their mobile forms platform). Also, if you're not familiar with the technology, you'd definitely need to engage a consultant in addition to purchasing the require server-side modules to render your forms in HTML5?
Questions:
1. What mobile devices are being used in the field?
2. Do your forms absolutely need to be made dynamic, or could they be saved as "static" XFA, instead? If you're doing things like adding rows to tables, hiding/revealing subforms, etc. then yes, the forms would need be dynamic. But if your forms do not need to be dynamic and/or you can tweak the design logic so the form is rendered in a static layout, then using the forms on an iPad is possible via the app "PDF Expert". PDF Expert can read/render static XFA files HOWEVER there's no support for javascript in that format. On the Android side, the app "qPDF Notes" provides support for static XFA PDFs.
On the other hand...if users are able to use a Windows PRO based tablet (i.e. something like the Surface Pro 2, or even something less expensive running Windows PRO - not RT), then you could install Adobe Reader or Acrobat and use the dynamic forms, as is, on those tablet...no need for HTML5 rendering.
In either case, the solutions mentioned about would be far less expensive (and less complicated) to trying to using ES4 mobile forms.
Hope this helps!