sawyerloggingon,
I think you would be surprised how capable a smaller compact class B+ with Duel Rear Wheel (DRW) is on very primitive dirt and gravel roads. The only issue would be the amount of "rear over-hang", potential for dragging the tail on the road when approaching or getting off steep grades. A 4x4 would be wise to have in deep mud and soft sand, but if those extremes are more than planned, then a DRW will serve you nicely. Just try to pick a scaled down rig to get you through over-growth and such.
Our now eight year old rig
HERE is 23'-8" long, 9'-10" to the tippy top of the a/c unit, and only 93" wide, yet it offers everything practical the bigger rigs have. You might want to check out the new ones
HERE to see if new or used (with or without the optional slide out) appeals to you. They have been made for over 11 years now so you have flexibility with regards to price.
If you want the rig to have a lower profile yet to clear branches better, consider replacing the roof-top a/c unit with a pop-up sunroof, and manage with chassis a/c alone. That is a viable option for an older rig with a broken a/c unit.