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BMW & Swift

The BMW X5 30xd and the Swift Challenger 635 with a laden weight of 1680 kg is a good match.


weight ratio
towball limit

Flat roads

8th gear


hill starts


1680 kg 2320 kg
90 kg

Score 8.3



  • Speed on motorways
  • Hill starts
  • Usability highest gear
  • Higher revs uphill not necessary


  • No salient features

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Number of useful calculations


The BMW X5 30xd and the Swift Challenger 635 of a laden weight of 1680 kg is an excellent combination for all journeys on all kinds of roads.


The chance of snaking is relatively small at normal speed, if the caravan is well loaded.

Flat roads

The performances of the engine of this outfit are in general very good. Under all conditions on motorways it is possible to drive with 60 mph in the 8th gear. In that case the engine runs approximately 1500 rpm. Maybe the engine is not running smoothly at low revs so it is better to shiftdown to the 7th gear, the engine runs in that case 1900 rpm (witch is maybe more noisily than usually accustomed). In a headwind or for example on a crossover there is no need to downshift immediately.


On most motorways inclines (1:20) driving is easily possible in the 7th gear with 50 mph and even full throttle with 66 mph but maybe the engine is running better by somewhat more revs in the 6th gear). In the 5th gear the top speed is 82 mph (3955 rpm). Hill starts are possible on steep slopes, theoretical up to 53%, if the wheels have sufficient traction. Because the car does not have enough power at low revs, we recommend a gradient of more than 44% not to drive.

Attention: This car can easily drive much faster with the caravan than is safe. So always keep an eye on your speed!


The main details in a list. Ideal for comparing different combinations with one another, for example your present with a new one.

Towing limit
3500 kg
Weight ratio
(laden Caravan / laden Car)
(1680 kg / 2320 kg)
Towball limit
140 kg
90 kg
Score at optimal noseweight
Infuence pay load
Flat roads
Top speed
103 mph (7th gear)
At headwind
97 mph
Speed in practice
99 mph (7th gear)
0 - 60 mph
14 sec. - (max. 12.4 sec.)
30 - 60 mph
9.1 sec. - (max. 8.3 sec.)
50 - 60 mph
4th gear: 3.2 sec. (max. 3.8 sec.)
Power at 60 mph
Highest (8th) gear
often useful
Gears in practice
8th gear
7th gear
Revs at 60 mph
Percentage between accelerator
54% - 62%
43% - 49%
Power needed at 60 mph 1730 N
over: 1383 N
over: 2420 N
Motorway inclines 1:20
Speed (maximum)
82 mph
In the
6th gear - (5th gear)
Acceleration 30 - 50 mph
7.2 sec. - (max. 6.3 sec.)
Normaly at 50 mph in the
7th gear
6th gear
By revs
Percentage accelerator
By full throttle
Hill starts
Maximum incline
50.4% - 54.5%
Minimum speed (whereby power)
6 mph - (9 mph)
Mountain roads
Maximum slope driving
Maximum speed on 1:8
59 mph in the 4th gear


Download a fact sheet in PDF

Details combination

You may customize the data to your own situation.

BMW X5 30xd
September 2013 - 2018
kW (258 bhp) at rpm
Nm at - rpm
kg user payload kg
/ R
automatic with 8 gears and torque converter
Towing limit
kg (towball limit kg)
Swift Challenger 635
kg Payload kg
kg (twin-axle)
m. (8'6")
Overall width:
m. (7'5")
Overall body lenght:
m. (22'3")
Shipping length:
m. (26'3")
Actual gross train weight
4000 kg
Stated vehicle gross train weight


User Payload:

Output in km/h or mph:

Other Car:

Other Caravan:


The BMW towing a Swift Challenger 635 (1680) kg reviewed by Adrian:

Exact Car is BMW X5 3.0d M Sport.
Exact Caravan is Swift 635 Fairway Dealer Special 2017 with quad motor movers fitted and weight limit increased to 2000kg by Swift.

The X5 was a dealer demo car with 1500 miles on the clock but didn't have tow bar fitted. Dealer wanted lottery win to fit removable BMW tow bar and I found out that BMW fit Westfalia tow bars so got independent tow bar specialist (PF Jreones) to fit it with 13 pin electrics using BMW bespoke wiring kit (doesn't invalidate warranty). Only thing they couldn't do was enable the Tow Bar zoom feature on the reversing camera, really useful for error free hitching. BMW refused to enable it as they didn't fit the tow bar and wouldn't accept the liability ???? Independent BMW dealer could code it but wanted £70 + VAT. I bought ODB reader from Amazon for £17 and downloaded Bimmercode for £20, did the job myself, dead easy.

The weight limit upgraded on the 635 as the quad movers added to the mass and gave very little load margin. Upgrade was simply a new rating plate to stick over the old one and a new NICC certificate. The Alko chassis is rated at 2200kg so there is plenty of margin. The only difference is the tyres need inflating to 36psi instead of 30.

The X5 pulls like a train and never suffers from overheating our struggle on hills. The downside is the MPG drops from a normal 34 to a paltry 24 when towing. That's the price you pay for towing 1840kg of caravan (confirmed on a weigh bridge). The car sits well on the road and is not pushed around by the van, suspension on comfort setting seems the best. Sport makes the ride too hard for my taste but might suit some.

Highly recommended as a tow car and solo it is the dogs!!!!

The BMW towing a Swift Challenger SE 645 (1745) kg reviewed by Andy:

Car is X5 sd M sport remapped to 348bhp, caravan is Swift Ace Pioneer 6 berth. The X5 is by far the best tow vehicle I have ever had. We have the 7 seat model and have towed all over France with family of four and grandparents. The stability of the X5 is outstanding, the increased torque makes towing an absolute breeze. I would highly recommend, MPG low 20's when towing.