In this video you can see a few examples of what to bear in mind when driving in Iceland so as to avoid these hazards and have an accident-free holiday.
Is it hard to drive a modified car?
 No, it is just like driving a normal car. It is Arctic Trucks aim to  keep the driving abilities of the original vehicle, even improve it. In  normal conditions you should not feel the difference, but when it gets  tough the difference is huge!
In Iceland today, most modified  vehicles are used as a normal family car as well as a truck for highland  tours. Meeting both good normal driving performance and the super  off-road capabilities is a challenge. Arctic Trucks has specialized in  offering modification that combine that nicely, based on the preferences  of our customers.
Why the big tires?
 Larger footprints gives lower ground pressure so you can drive on  softer grounds with minimum disturbance, no matter if the ground is  snow, dirt, sand or anything else.
Larger tires give higher ground clearance, making it easier to drive over rough surface, rocks and snow.
Large  tires rolls easier on rough surface, with the tires eating up more of  the surface irregularities.  The tires give better ride and less load  and forces on the suspension of the car.
In Iceland people have been experimenting with using bigger tires in snow for over 25 years. People used to use snow chains on the tires to increase the traction and to pull you further through the snow. Soon people discovered that by lowering the air pressure to 2-5 psi, large tires could make a normal 4wd vehicle drive on top of a soft snow.
What is Arctic Trucks Modification?
AT32
When we modify an SUV to 32“ tires, we  usually lift the suspension to achieve the same clearance as before.  There is no need for extra fender flares, as the offset of the wheel,  fits the original fenders. The AT32 gives your SUV a stronger and more  robust look, smoother ride on rough roads and increases minimum ground  clearance.
AT33
When we modify an SUV to 33” tires, we  lift the suspension at least 20 mm. In some cases we would add extra  fender flares, but that depends somewhat on the individual SUV or the  size of the wheel. If extra fender flares are added to the vehicle, it  will increase the visual affect on the car. With the AT33 you will be  able to drive your SUV off road, without loosing the good driveability  and luxury feeling in normal conditions. You will have increased ground  clearance, softer ride in rough terrain and more flotation when driving  in snow, soft sand or mud.  
AT35
When we modify a SUV to 35” tires, we  lift the suspension 40 mm, and in some cases we would lift both the  suspension and the body. Extra fender flares are used when modifying to  35” or larger, which gives your SUV a powerful look and separates it  from all others. With the AT35 you can take your SUV to almost any  mountain road in the world, with out having any trouble. The AT35 will  give you much grater ground clearance, better traction, softer ride,  higher seating and most of all a feeling of confidence. Also will it  give you the possibility to deflate your tires, so that you get a better  flotation in snow, sand and mud. The AT35 is ideal for hunters, farmers  and park rangers, or just for those who want something different from  the rest.
AT38
This modification is mainly for utility and  rescue vehicles. When modifying to 38” tires, you are far exceeding the  normal off road capabilities, with flotation on snow as the core  benefit. This modification requires, both lifting of the suspension and  the body. Extra wide fender flares are used, 15 x12,5” wheels, 4,88:1  gear ratio, and many other modifications to the various parts of the  undercarriage and the body.
With the AT38 your SUV will become a super offroader, with remarkably good driveability on normal roads.
The  AT38 is ideal in remote areas, like police and rescue work,  construction companies, tourist driving, scientific work and many other  difficult tasks.   
AT44 
This is an extreme modification for  extreme conditions. When modifying to 44” tires, we lift the suspension  as well as the body. Extra wide fender flares are installed and 15x16”  wheels are used. Gear ratio is lowered and often an extra low gear is  added to the central gearbox.  This is strictly a utility vehicle for  use on glaciers and areas covered with snow. In Iceland, the AT44 is  used by professional mountaineers, rescue teams and others, who need to  travel in the highlands over the wintertime.   
Why modify a perfectly good car?
 Road and weather conditions can vary by countries and seasons, what  fits one market or one customer might not be the best combination for  another.
Generally larger tires increase off-road capabilities  for most conditions, especially in snow. In Iceland people have been  experimenting with using bigger tires in snow for over 25 years. People  used to use snow chains on the tires to increase the traction and to  pull you further through the snow. Soon people discovered that by  lowering the air pressure to 2-5 psi, large tires could make a normal  4wd vehicle drive on top of a soft snow.
Early on modifications  were mainly focused on off-road capabilities. The customers were mainly  off-road enthusiastic individuals, utility companies and farmers. As  demand increased from people who wanted to try something new or just  liked the look of a bigger car and the possibilities the big car  offered, the focus was more and more placed on maintaining drivability  under normal conditions and maintaining high reliability. Soon owning a  modified vehicle became a lifestyle for many people; the possibility of  travelling in the highlands and getting to places very few had ever seen  became attractive to many people, even though most of the time the  vehicle was used for on-road driving.   Style and image has therefore  become one of the key issues when designing modifications.