Hi All - I am a new Grenadier owner and even newer member to this post. The fieldmaster will be spending this fall in Nantucket, MA where it will be used for beach access driving. Other SUVs we've used on the island for beach access and driving we only deflate all tires to 15-18 psi and didn't have differential lock options. For the grenadier, are the rear or front differentials or both engaged for beach driving? Do you engage the off-road mode as well? The beach sand in Nantucket can get deep in some areas but also hard packed closer to the shore access. Apologies if these are too elementary for this crowd but the last thread on this was over a year ago and didn't find any relevant answers to my questions. Appreciate any guidance you have here.