The safest way to do this is Glide-Rite
The down side no US private sprinter owner, is prepared to commit to the price. Firestone as similar in fact both share the same airbags, but that's where it stops.
it's available in the USA
Cost ranges from US1500 to US $5000 plus it's a bolt in system but needs tech evaluation for the BFDV to be reset for adjustment
It does have MB certification of tolerances, but it's Glide-Rite is a separate stand alone warranty.Warranty applies only if professionally fitted by a certified installer.
VB is a Euro version.[Blue version] Too expensive to get into the states.
Richard
Forgot to mention this system allows for height adjustment to suite your requirements.