Pilote aventura P670TP & motorcycle carrier.

Stealth1970

Hi guys and gals, just bought an 09 pilote aventura p670tp low profile and cant seem to find any info about fitting a motorcycle rack and weight limits. I only passed my test in 1997 so cannot drive anything over 3500kg motorhome. i need to know if fitting
a motorcycle carrier and 150kg motocycle will overload the rear axle and/or take it above the 3500kg gvw?

short of taking it to a weighbridge, i was hoping one of you can help me....i have scoured the interweb and cant find out what i need.

Thanks muchly in advance :-)