i see after a page of answers no one really answered your question.
i don't have any experience with inflatable kayaks, but Sevylor and Sea Eagle are two reliable company's that make inflatables. i've owned 2 Sevylor rafts before and they were durable.
but if you do decide to go with a cheap fiberglass one there is always the option of getting a small trailer for them.
2001 Jeep WJ 4x4