I don't think our E450 based two-wheel drive 24 foot Class C motorhome is by any means "the best RV for dirt road use", but it is quite rugged and WE DO take it on dirt/gravel roads if required to get to and camp where we want. We even have taken it (driven slowly) on 4X4 roads at times.
However, when doing this we use one trick to keep the dust out that will work for just about any RV on dirt roads: We close up everything except for one 12V powered rooftop vent fan in the front part of the roof. We turn the fan's rotation direction to AIR IN and turn it's speed on LOW. This keeps a small amount of air pressure inside the RV at all times so no dust can enter anywhere. Of course we also make sure that the cab's A/C is on INTERNAL AIR so that no outside air is drawn in from this, either.
In my opinion this is about the ultimate affordable off-road RV for the North American continent (not necessarily for jungles and/or other continents) while at the same time offering a reasonable non-minimalist amount of self-contained RV comfort - with the emphasis on "affordable" and "non-minimalist":
I'm sure you will get a variety of answers to both questions. The basic Ford vs. Chevy vs. Dodge debate. Honestly, I think it will depend on how the truck is outfitted....the tires, shocks, gearing, etc.
With the right air filter, it may not make much difference
As for the RV part of your question, I think that most would suggest a TC on the back of one of the 4X4 trucks. I've also seen some 4X4 vans which have been raised a bit, which might be nice.
Some will swear that the best set up, is a Jeep towing an "off-road" (raised axle) P'Up....that you can get just about anywhere with it, and it will be roomier than the TC.
Yup, lots of choices, and opinions, which are like noses (keeping it clean), everyone has one!
Bill & Claudia / DD Jenn / DS Chris / GS MJ Dogs: Sophie, Abby, Brandy, Kahlie, Annie, Maggie, Tugger & Beau RIP: Cookie, Foxy & Gidget @ Rainbow Bridge.
2000 Winnebago "Minnie" 31C, Ford V-10
Purchased April 2008 FMCA# F407293 The Pets
For me an ATV has been the best dirt road vehicle (where legal) here in CA. They seem to run forever without a lot of work, I don't feel like I'm shaking up an expensive truck, and cleanup is easy. They're small and fun and rock and brush scratches, who cares...
Second best for me has been the Wrangler. Relatively small, the dirt is it's best foot. Lots of them just see street use, and as used vehicles have lot of dirt life left in them. The don't need a lot of mods just to run dirt roads.
For RV I really don't know, but the Tiger posted above sure sounds good.
GM vehicles suck in dust. You can't turn off the outside air. Even on recirculating air you get dust and odors.
2010 GMC Sierra 2500HD 4x4 Duramax/Allison w/45 gal Transfer Flow Tank
RBW X16 Slider, Yamaha EF 2400iS
2007 Springdale 245 5th Wheel - E-Z Flex HD Suspension & Mobile Outfitters Shock Kit Upgrades
with Firestone Transforce Ht Lt 2357515 C tires
GM vehicles suck in dust. You can't turn off the outside air.
Hmmmm....I can on my 1995 GMC 4X4 K1500 pickup.
I just push in the button with the "U" symbol that points to the left. This is just a symbol representing internal air circulation only. I can have this button pushed in for any combination of heating or cooling desired.