On dry, firm roads, pretty much nothing.
Treads are there to deal with water and soft surfaces.
Modern treads are also designed to help avoid hydroplaning on very wet roadway, without treads a car would very easily hydroplane (completely losing contact with the roadway when there is even just a little water over the roadway, causing the car to 'float' with no traction whatsoever).
You will lose traction especially on wet roads.
The more surface area of the tyre that is in contact with the road, the more friction (stopping power) you generate. the reason you have treads on tyres is so water/dirt/snow can flow into the tread gaps. without treads, the water would have nowhere to go and the tyre would never actually touch the ground (hydroplaning). To answer your question, adding treads offers little benefit in dry conditions, only when it is wet/snowy/dusty on the runway.
If the tyres would not be round they will not move.
Normal pneumatic tyres do not work correctly without air. Run flat tyres do, so do solid tyres.
If the tyres are in good condition ( treads on tyre and have no punctures ) It would be fine :) Im guessing the Motor home had been left standing for a while so make sure you pump up the tyres to the correct Psi Specified with the model, also check the pressures over a 3 day period for any dramatic change.
Refer this site for information about the rubber treads and http://www.angelfire.com/az/tile/rubber.html
It is important to closely inspect the condition of the tyres. Looking for damage and splits, and to ensure the depth of the tyres' tread are legal or even better.
You can go to Buy Cheapr online, as they are offering to buy tyres and sell them for cheap. However, probably the best place to look for used tyres in London would be at Gumtree, a website for used items.
There is a video on the DIY (Do It Yourself) website which explains how one would install non slip stair treads. There are many steps to follow but they are explained clearly in the video.
You are able to switch to conventional tyres if you currently are equipped with Run-Flat tyres even if you have a mini cooper. The only thing that i would inform you of is that if you change to conventional (Normal Tyres) then you would need to change all the tyres that are on the same axle to make sure that the vehicle will not pull to one side when driving. Other factors that will be effected due to not changing both tyres to conventional tyres on the same axle will include; The braking distance of the vehicle and the drive off the car. These are very important things that you need to keep in mind when changing from Run-Flat to conventional tyres.
If it's just the rear axle which has dual tyres, then the answer would be six. If both axles have dual tyres, then eight.
The number of treads a quad-core processor can handle depends on the processor and model. Some are designed to handle two treads per core, which would give you eight total, but others can only handle one per core, which one be four.