Hiya John, you're obviously doing the right thing by voicing you're concerns and asking for help. I'll try to help, but at the end of the day, if it's legal, you pay your money and you take your chance. So here goes.
The 85 percent rules isn't necessarily there for beginners. it's a figure bought about by considerable experience within the industry within the UK. It would seem that the Freelander can tow up to 1800kg and that's great, but let me put this to you. You can tow on or near the maximum for years and never experience the tail wagging the dog, or need to make an emergency maneuver. Because of this, no matter how long you have been towing, you wont have the knowledge to help, should you get into a tricky situation. Only by getting into unusual or even dangerous situations will you develop the skills needed to tow at 100% and over. Totally impractical I know, so you will have to rely on the equipment you have, to do the best it can, to avoid an incident. I have been towing for some time now and apart from getting to places like Stowford Farm, have had it easy, so have learned little. I once had the caravan snaking (down to my own stupidity) but having a well matched car meant, although it was a worry at the time, it didn't develop any further and was easily controllable.
There are those on the forum that tow to the max weights and have never had a problem, I say good luck to them, and I really mean it, nobody wants a van and car spread across the motorway. However, my advice is for you to get (if practical) the best match you can and when you become a seasoned caravaner (no doubt you will) still respect the 85% rule.
As for getting a better deal, that's a whole new question itself and has many answers but if you're fortunate to have a few dealerships near where you live, playing one off against another might help. This is also the season of new models being rolled out, so if you don't mind this years caravan, they are usually priced to sell. The dealer can clear his show area and they are usually in stock too. Ask for a starter pack regardless, things like a battery, steps and crockery all help to bring the overall price down, being cheeky with it, often works.
Hope this helps