I move mine two times a year for many years. Only about 600 miles but still I prep it for travel pretty much the way I received it when I purchased it. I saved the orange plastic stop that hold the print head in place and install it the way it was originally. Hopefully you saved it......I also took a picture of it installed to help me re-install it. ( I can send you that picture if you need it to refresh your memory how it fits in place). I then tape all the lids so they can't open and break.....ink lids, main lid, lift arm.....I also saved the foam ends it came shipped with.....Absolutely remove the stand and strap it down to something. I put on the foam ends and strap it down in my van. If it's going to be shipped I would strap it to a pallet so it can't be put on end or less likely to be bounced around. I have had mine at a 45 degree angle many times without ink leakage, but only for a moment moving it up steps. I think it's fine to leave the heads and ink cartridges in place.......never had a problem with mine.
If you have any other questions let me know.