Car load weight calculations

[nurulk]

Hello,

Finally invested in a roof bars & roof box and tow bar & tow bar bike carrier (ouch $$$)! Going on a camping trip soon, now wondering if I will be able to take both the roof box and the bikes at the same time. Not so easy to gather all required info and calculate the load weights etc. Wondering if anyone could look at the below and let me know if my calculations are correct or I am missing something obvious? Also would be nice to hear from anyone else who uses a roof box and bike rack at the same time and their experiences!

First of all specs:

Car - Nissan Qashqai +2 2009-2014 Specs
Nose weight: 75-110kg
Roof weight: 75kg
Loading weight: 545kg
Engine: 1.6 Petrol

Roof Box - Thule Motion XT Large
Load Capacity: 75kg
Weight: 20kg

Towbar - Witter Swan Neck
Weight: 25kg
Nose weight: 100kg

Bike Rack - Thule VeloCompact 927
Weight: 22.4kg (18.9kg + 3.5kg for 4th bike adapter)
Load capacity: 60kg

Then calculated nose weight, roof weights and total loading weights separately:

Nose Weight Calculation
Towbar: 25kg
Bike Rack: 22.4kg
4 Bikes: 40kg
Total: 87.4kg

Conclusion: 87.4kg Total well within nose weight limit for both towbar (100kg) and car (75-110kg). All ok.

Roof Weight Calculation
Roof Box: 20kg
Roof bars: 5kg
Roof feet: 1.8kg
Gear weight: 44.4kg
Total Roof Weight: 71.2kg

Conclusion: 44.4kg Gear weight well within Roof Box Capacity (75kg) and 71.2kg Total Roof Weight within cars roof weight limit (75kg). All ok.

Loading Weight Calculation
Nose weight total (including Towbar/Bike Rack/Bikes): 87.4kg
Roof weight total: 71.2kg
Passengers: about 200kg (2 adults + 2 young children)
Heaviest boot item: Tent 40kg
Total load weight so far: 398.6kg

Conclusion: Well within loading limit (545kg). However not calculated other gear weight in boot, but leaves me with about 145kg to spare?

I will have to add weights of other gear in boot, but I assume as long as its less than 145kg worth (which it should be), I am ok with all weight limits is that correct - or am I forgetting anything else?

Many thanks,

Nurul.

[Qashowner]

If you have a tow bar, have you considered towing a trailer rather than load up the car.