Using a tongue extension actually lightens the applied hitch weight to the truck (which is good). What you have watch is when you go through dips or driveways that you do not make contact with the underside of the camper or one of the rear jacks (which is bad).
Using a receiver extension reduces or eliminates the chance the of the tongue interfering (which is good) but now you have more leverage against your receiver (which is bad).
The simplest solution is also the most expensive by replacing your receiver with a SuperHitch and SuperTruss. It will be a big sting in your pocket, but it will only be once until you decide to replace the truck. Other solutions, like using a heavy 2.5" receiver with extension can accomplish what you want in a safe manner for less money, but you will only have about half the capacity of the Torklift setup when using a less expensive extension solution.
Think about your usage today and how soon you think that will change to make your decision. I know what I like (I'm on my second one), but my demands are much greater than yours.
