Under C&U regs the DAF has a max of 32t and the King DB20 18t. However, the max GCW in the UK is restricted to 40t rather than 44t as neither vehicle has road friendly suspension, the DAF engine does not have the required emission spec and the trailer only has 2 axles. The twin tyre on drive axle requirement is met by the extra wide tyres on the DAF.
The DAF is 14.038t unladen, the DB20 is 3.38t and a rack is up to 1.5t depending on type.
So, DAF + rack + M3 is 14.04+1.5+12.9=28.5t give or take
DB 20 + rack + M5 is 3.4+1.5+(9t??)=14t give or take as not sure on the M5.
GCW is circa 42.5t so overweight.
Special Types would not work as it is a divisable load.