Hello Guys

I have an EL Futura Sedan fitted with extra low King springs and I would like to raise the suspension to one inch or so over standard. My reason is I love my car and I am setting it up for long term caravan towing (some dirt tracks will be travelled) Everyone tells me I need a 4x4, I say I just need to raise the car and I end up with a Longreach Tradesman.
Question, will the front springs from the 1 ton Tradesman fit the sedan?
Can anyone recommend a GOOD spring makes for the rears?
And the old question of Shocks, what did the Tradesman use?

Thanks for your time and it`s a great site
Leo53