I would be concerned with a couple of things.
1. Are the components of the lift kit rated at the same capacity as the factory ones? Some are but some aren't.
2. The angle of your trailer. It might only be a rear lift of 2", but that could make a huge difference. On my truck when the bed is level with the airbags, the trailer sits a smidge higher in the front. I had to lower my 5th wheel hitch to compensate. But now it is as low as I can go without hitting the bed sides. That is with a stock rear suspension. With a 2" lift in the back my trailer would sit high in the front all the time. Not necessarily a good thing. Something to think about.