The OP should also remember that the TV will need to be retuned on arrival at every site and when returned home. Also don't forget to look where the warden's aerial is pointing or that on a nearby house and which way up it is (prongs horizontal or vertical?) and replicate it with your caravan aerial, assuming that the caravan is fitted with a directional aerial that you can adjust yourself. The narrow end of the aerial should be nearest the transmitter. Aerials on touring caravans will usually be found pointed every which way and every way up, even with the side of the aerial towards the transmitter so should be ignored!
As a further note: when tuning you will only get about 14 stations if your serving transmitter is a relay (which in most cases will need the aerial vertical) but maybe 70+ if you are using a main station. If the TV has an HD tuner then you will only get channels 1-5 and BBC4 in HD from a relay.
Two final points: your shiny new caravan will likely have a DAB/FM (car) radio fitted. Firstly as the unit does not have a memory backup supply (caravans never do) it may remember the stations between sites but it will likely forget all the other settings. Secondly DAB is transmitted with vertical polarity everywhere in the UK so if your serving transmitter requires horizontal your DAB signal will suffer, not aided by the fact that DAB is not necessarily transmitted from the same site as your TV signal. If the TV signal is vertical then there is no problem as the aerial that is directional for the TV signal is not directional for DAB or FM signals and will thus receive radio whichever way the aerial is pointed.
Finally if your caravan is fitted with a Status VP3 or VP5 aerial amplifier there is one thing that the handbook or manufacturer data will not tell you. The amp has one input, one radio output and three TV outputs. The radio output carries the same TV/DAB/FM signals as the TV outputs except that it is not amplified, so you can gain benefit on a poor radio signal by moving the radio aerial cable from the radio outlet to a (usually spare) TV outlet on the amp.
Oh, and last of all, if you have an external connector (often inside the 13A external socket housing) the associated cable that will be found adjacent or connected to the amp (and labelled) can be used as an outlet so that a TV can be used in the awning, or an input for an external aerial should you need one in which case the signal should go through the amp, or an input from a site distribution system (i.e. from the pillar) or from an external satellite dish in which case it should be connected direct to whichever internal cable is needed and must NOT pass through the amp.
Sorry to all for this long epistle - I hope it is helpful.