Hi all, some advice please; (Vehicle is a 2008 X5 3.0D 7 seater)

• Which is the best diagnostics and coding tool? I have heard the names INPA and GT1. Do these need a laptop? Is here a handheld unit available that can do diagnostics, coding, programming, etc. Something that can be carried in the vehicle without the need to take along a Laptop? (Any advice on this subject will be appreciated) I have a Carsoft 6.5, but it does not handle the E70 - is there upgraded software for Carsoft?
• I see that Bentley have still not released a workshop/ repair manual for the E70. Is there any other manuals/ resources that you guys are aware of or using.
• My vehicle seems to sag/ low at the rear, but it is level and does not increase height when driving. I know that the battery was disconnected and that the vehicle is in "Transport Mode" (used a handheld scanner). From what I have read, the transport mode actually should raise the vehicle. Thoughts?

Thank you

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2015 F15 X5 3.0D
2008 E70 X5 3.0D
2001 E53 X5 3.0
2001 E46 318i