Depending on how far you have to tow the lead may be an issue. The route around this is on ling trips just distribute it around the boat evenly.
I always run 320lbs of lead in my bow under the seats. The boats handles much better with bit weight in the bow. Even when cruising, before I had the lead (pop bags), i always ran with my locker sac full. The boat handles the chop better and rides better with the bit of extra weight up there.
When you put couple people up there though you will want to even it out. Otherwise you will be low riding for sure
That locker will be constantly wet. No matter what you do somehow water always pools in there. Wet bodies ,rain and other wash from waves going into the blower ports on the rear all end up in there I would hesitate on putting sand, lead, or anything that may rust or get nasty in there. A sac really is the only thing. The length is 80 ft. I can't recall the diameter if its 10inch or 12 for the sac .
Current: 2008 Super Air 210TE
Previous : 2000 X-Star, 3000lbs ballast, LTR 330, Acme 1235 14.5X14.25prop. 1200 hrs of flawless fun