Arrrgh no. As soon as you mention the subject everyone seems to get worried and fretful. See you're doing it now!
The rules:
[You must be registered and logged in to see this link.] Ignore the page talking about new rules in 2013. As explained in this piece the rules are the same as now. I do think there is a change but it is not relevant to what we're discussing.
This second page explains the rules as they apply to a post 1997 license holder:
[You must be registered and logged in to see this link.] So loosely using these figures (Do check with your car plate. Internet figures can be wrong. Though unlikely by a significant ammount in relation to what you want.)
[You must be registered and logged in to see this link.] Realised I'd made a mistake in my calculations at this point so needed figures with the maximum permitted mass for the Alhambra [You must be registered and logged in to see this link.] See Seat quote mass in running order not kerbweight and you need a definition of their maximum figures as well. This is why if close the car itself must be checked for
Plated figures.
Revised figures.
The minimum kerbweight of any Alambra is a 2000 2 litre Alambra at 1645Kg You may not tow any caravan plated at over 1645Kg. I (pre 1997 license) can tow a plated weight of the set maximum for the car at 1800Kg. But also the "Maximum Weight Allowed" (Seat's Term) Is between 2290Kg and 2540Kg Assuming this to be the same as Maximum Authorised Mass (MAM) we see your total limit to leave between 1,210 Kg and 960Kg for the trailer.
The 2005 Tiptronic has a kerbweight of 1831Kg As you have a maximum train weight of 3,500Kg if the trailer is plated at above 750Kg then the maximum plated weight is 3,500Kg - 1,831Kg = 1,669Kg.Yet as above the limit is actually set by the maximum train weight. That is 3,500Kg less 2290Kg to 2,540Kg So still leaving between 1,210Kg and 960Kg I can tow a plated weight of the design maximum of 2,000Kg and then have a train weight of up to 4,540Kg
The maximum authorised mass of a Destiny (Highside) is 1,00Kg.
I'm told VOSA will only prosecute for actually weights exceeded not theoretical plated weights that might exceed. N.B. This is what I believe I'm not suggesting any possible offence is a good idea and the police are still free to prosecute.
You could theoretically have Ian (Riva Leisure The Manufacturer) re plate a Destiny to 960Kg to be totally legal in the worst circumstances. Oh silly me the Dandy isn't actually plated per se. (Please correct me if the last dark blue Dandys differ) All they have are the weight parameters stamped on the ALKO draw bar. This is not the same. If by some chance your Alhambra is the one with the highest MAM I think your chances of prosecution for a theoretical offence of 40Kg is something less than nothing. Of course if you load like Helen and the Destiny ends up weighing 1,600Kg then that may be another thing altogether.
The Camping and Caravanning Club and The Caravan Club always suggested an 85% limit of Mass in Running Order (Not kerbweight{Slightly different}) for those new to towing.
You are not troubled by these weights either and if for another veicle you were to exceed the 85% rule I'd say as a personal oppinion it's not
as important on trailer tents where the Centre Of Gravity is lower than caravans.