Ifors generally hold there value pretty well, esp when u look after them mines does mibee 20K miles a year and could be getting on for 10 yrs old and i'll probably still get 50+% wot i paid for it and its not in brilliant nick, been used a lot on small roads all year round.
Evn with an aluminmum floor i'd put something down below ur quad wheels as it will wear throu when u do enough miles, 2 strips of cow matting does quite well and i just pull it out f i need the flat bed again
Definately don't leave it with hand brake on as mentioned above and remeber to take trailer hand brake off when u drive somewhere!!!

Surprisingly easy to do. I forgot fairly recently as i hardly ever put it on so brakes are done.
Been driving it since with no brakes and not an issue, as long as ur driving at sensible speeds and only having small loads in.
The problem we had with unbraked trailers was not so much the pushing on, but lack of a solid axle when doing high mileages
Ur 750kg towing limit will include the trailer too so really on towing 1/2 a t in wieght
Just wondering on the legal side and slightly of topic, but a car has to be capable of pulling the fully laden wieght on a trailer (ie u can't tow an empty 3.5T trailer legally with a car)
So does the drivers licence also have to be allowed to tow the loaded trailer? Ie could a younger driver with no trailer test on licence tow an empty trailer that can hold more than 750kg