slight shudder over 30mph - Lexus RX400h - 2006

just wondering if anyone can help me out on this. the car is giving a shudder when over 30mph. done a quick google search and found that 90% of shudders are caused from the wheels needing re balanced ? that just seems like too simple a solution to me ! so just thought i would ask you guys for your thoughts on this. The car will be up for sale soon so just trying to get it sorted out before it goes.

Don't need a fake 4x4 anymore now i have a real one  Range Rover Vogue 2006 4.4 AJV8 | Buckingham Blue | Parchment Leather | Supercharged Grill+Side Vents | CA02 HEY ( NOT 02 PLATE )

Have you checked tyre pressure ?? That can also give shudder sometimes. But it is worth checking tyre balance as well, cheap first potential solution  MY 2010 5.0 SC Galway green and sand interior!!
Have the Faultmate MSV2 Extreme to be tinkering with the settings etc. !!

thanks , Will get the pressure checked ASAP . the front two tyres have only got just over 2mm on them although i don't want to replace them as the car will be sold soon. will get them all re balanced and see how it goes from there. car has just passed mot with no advisories so can't be anything obvious underneath. fingers crossed its just the tyres Range Rover Vogue 2006 4.4 AJV8 | Buckingham Blue | Parchment Leather | Supercharged Grill+Side Vents | CA02 HEY ( NOT 02 PLATE )