Levelling up a twin axle caravan.

Short piece of wooden floorboard under wheel works well for single axle caravan, but would imagine a longer piece needed for twin wheels.

Lock n level is good however….. it depends on what type of pitches you are likely to use whether you actually need any levelling devices. The vast majority of club hardstanding/gravel pitches are pretty level so unless you are very pedantic you are unlikely to need any levelling. On gravel pitches it is often quickest/easiest to scrape away the gravel on the high side and pile it up on the low side. I had an LnL used it once and never bothered again. The site we were in 2 weeks ago had cross falls on gravel pitches. The pitch next to ours was occupied when we arrived by a van with ramps under the wheels, blocks under the steadies. I simply assessed where the wheels would end up, scraped the gravel and parked the van. The guy with the van on ramps and blocks looked rather crestfallen after i had set up in 2 mins against what I suspect was a rather longer process for him. Yes, we still had a slight cross fall but nothing that stopped the shower or kitchen sink draining fully. As with many aspects of life, don’t overthink or over perfect it. 

I use the Locknlevel system on a single axle and it works a treat so easy to align the Alko wheel lock and level the caravan I've seen them in use on twin axle, they are expensive but certainly for me I find it so much easier than the planks of wood I used before.

The other aspect of not needing LnL is to ensure your insurance doesn’t need Alko wheel locks. Plenty of other security options that insurers accept. 

I used L 'n L on our previous Barcelona and for a couple of years on our present Knaus TA van. I have to fit twin Alko locks as a condition of the insurance on the current van and it was easy to do so. Never had a problem with the L 'n L in the seven or so years I used it. However, mobility problems more or less forced me down the path of having E&P fitted if we were to continue caravanning and I have to say that, although expensive, it's been absolutely brilliant. I can fit both locks and level the van in about five minutes. I opted for the Compact system which just levels laterally and saved over £1000 on the full system. Levelling for and aft is simple using the jockey wheel and you get an audible 'beep' when level is achieved. If I ever bought another van (which I very much doubt we will be doing), I would have E&P installed from the start.

I use LnL on a twin axle van. Simple to set up and using first just one bag enables an Alco wheel lock to be installed very easily. 

I have a twin axle and for levelling I use the plastic wedges (fiamma?). So far I have not found a pitch where I need more than a few inches difference. The trick is to saw one of the ramps across (approximately half way along the length). The whole ramp is placed under the wheel that is in the direction of travel. The half ramp is fitted between the two wheels. The motor mover then drives the wheels up the full ramp and half ramp. If any more height is needed, you place the remaining half of the ramp to extend the half ramp already in use. Cheap, easy to store and use and not as much of a faff as some systems. Putting on the wheel locks is a PIA because you still need a jack. One day, all vans will come with the hydraulic leveller fitted as standard, until then.....................

I use the traditional selection of wooden planks, a couple with one end cut at an angle to make a ramp up. Can't afford many trips to Club sites because of price increases, and CLs often have quite a difference across the axle.

I fit the first lock on the rear wheel, having placed it on top of a bit if rigid plastic sheet.  Then can move van forward to align second lock with rear wheel skidding along. All one needs is the motor mover.

I have always though the LnL to be too high a risk - if it developed a leak / puncture and dropped the wheel(s), all the weight of the van would be through the corner steadies, which for most vans are not designed to carry the load of the van and could result in damaging the floor.

I have some milenco stackers and other bits of wood, which have never caused me any issues with a Bailey 646 twin axle.