Nope going to go on a second (should have gone 10 minutes ago) just waiting for a download to finish.
Maz definatly get a RWD kit car for track days there lighter for a start a 172 with tralier is say 1.3 tones at best (900kg for the car if realy stripped out no cage plus 400 for a light trailer) more likly your looking 1 tone for the car with a cage and 600kg for a trailer at best since most drivers licences won't ley you drive and tow more than 3.5 tones gross weight and the trailer has to weight less than the curbe weight of the car you migh end up with a proble,. try find a 1.3 ton car which can take 3 tones easily. You have to account for the fact say 1 passenger so that 200KG in people weight a spare set of tyres tools etc thats 100kg easy so thats
1.5 tones of car
1.5 tones of trailer
300kg of extras
Hum only 200KG of max weight you ideal want a car much heavier than the trailer a 172 isn't light for starters.
I used my parents Suburu for towing my clio a few time and its annoying to deal with the extra weight etc also fuel economy isn't great so long drives are a pain.