Going to go with chocks under headers and a weight on the back to take the the pressure off.Removing the calipers and stringing up to take the weight off the joints. (not that the wheel fitters bother).
Some things I have googled
Silkolene Pro RG2 Grease
An advanced, high melting point, racing grease. multi-functional, high performance grease with exceptional heat resisting and waterproofing properties. It has outstanding water repellence, excellent corrosion inhibition properties and high resistance to water wash-off. It is ideal for bearing and chassis lubrication and conditions of water impact.
PRO RG2 is designed to meet the stringent requirements of competition use, including off-road, and stays in place, even under high temperatures created in competition use.
This high cling formula is ideal for protecting wheel bearings, universal joints, suspension linkages and seals under the most testing conditions.
Use for wheel bearing, rose joint, marine applications and all general automotive greasing.
MOLY EP LITHIUM GREASE
is a smooth textured high melting point, water resistant lithium base grease fortified with molybdenum disulfide (moly) to reduce wear by maintaining lubrication under conditions of high friction and shock loads.
Moly Grease
Moly grease is generally used for high pressure metal sliding against metal situations.
Greases containing moly are recommended for roller bearings subjected to very heavy loads and shock loading, especially in slow, or oscillating motion such as found in universal joints and CV joints.
If such greases are used in high-speed bearings, problems can be experienced with roller "skidding" where the bearing roller fails to rotate through the full 360 degrees due to reduced friction. As a result, the roller develops flat spots, and its service life is reduced.
In addition, CV joint/Moly grease is often manufactured to NLGI Grade 1 and would therefore not be suitable for automotive wheel bearings.
Multi-purpose Lithium-based Grease
Lithium grease is used in bearings where there are rollers, or balls under the load.
Grease made with lithium soap (lithium grease) sticks particularly well to metal, is non-corrosive, can be used under heavy loads, and has good temperature tolerance. With its resistance to moisture, it is commonly used as lubricant in household products, such as electric garage doors, as well as in automotive applications, such as Constant Velocity (CV) Joints.