Regarding the original question, a qualified yes.
If a lighter, higher usable power, longer lasting and maintenance free battery is worth the price difference, then yes.
However,
Don’t forget the added cost of potentially upgrading a converter, lead-acid charger, solar charge controller and if not equipped, adding a battery monitoring system to track the AH usage and charging of the Lithium Batteries. Unlike Lead Acid, a .1V change can represent 30% of battery depletion.
Also, don’t overlook security, now you have a lot more money in a tongue mount box or, as I found out, an easily defeated Lance locking trailer battery compartment.
A quick estimate for a simple upgrade not only included the cost of the Batteries but an additional $300+ in related upgrades.
We do dry camp and the benifits of weight, maintenance freedom and longevity are worth the investment.