U should hv consider the use of your pick up before making your purchase. There's nothing much u can do to increase height.
A shorty triton will always be a shorty triton unless u r willing to spend $$$$$.

Since u don't load your truck often, just leave it as it is. Modding will cost $$$.
Modding will change the driving characteristic of your truck. If your modder didn't do it right, u will hv problem, problem n more problems.

By how much u feel like increasing the height of your car?
Simple method is changing to a longer rear shackle. (only rear height)
Spring spacer for the front.

Method suggested above is simple n reversible. U may try it out.