I apologize up front if my comments here are not acceptable because I am barely a beginner within this military pool of experience, knowledge and equipment expertise. I have only bought axles and t-cases plus a few odds and ends so far, but am looking at collecting a few heavy haul vehicles as times rolls on.
So, I have been reading several threads similar to this as well as this one with great interest, as I am putting together my own version of an affordable personal rv. However, after drawing it all up, and actually putting the needs on paper, I decided to not buy the M820 at Idaho Motorpool and instead use a civi class 8 truck as the base unit. Right now class 8s with a large sleeper are cheeeeeep. Like scary cheap.
I have it down to 3 trucks and hope to finalize a deal this coming week. My plan is to haul my trail mobile over the rear axle. I have no need for the tandem as I will keep the rv on the asphalt, so the front drive axle will be removed. A short flat bed on a hinge for the small suv can hang over the rear axle quite a ways legally.
Used sleeper boxes are also cheap. So, I plan to, at least to get going on my adventures quickly, leave the factory sleeper in tact and add a second sleeper behind it, but facing the rear of the truck. This way I can frame the walk through opening of the spare sleeper and put a man door, lockable, in the frame work.
On each side of the truck frame, a tank can hang under the second sleeper, one for black water, and one for grey water. The fresh water can be mounted between the sleepers as can a cabnet with the fishing rods and other tools and supplies etc.
An APU will supply the power, ac, heat when no shore power is available.
My reasoning for going this route, is 1, to get on the road sooner with allready proven components for the living and sleeping. 2, because when putting something personal together, it is very difficult to know up front, just what the real exact needs are. Get out there, learn what is missing and what is never going to work or get used. Make notes. Modify accordingly.
IMO, and from what I have read online, for the most part, it seems that camping folks that go way out offroad into the woods etc, prefer to go there for the rugged nature of it. Usually, (but not allways of course) prefering a minimalistic style of camping. Many times, it was learned the hard way, and expensive way, that hauling or towing a really expensive or heavy and cumbersome vehicle into the woods that far, proved more work than play, ruining the overall experience.
I plan to keep the living quarters safe and on a predicatable surface, then go off road should I wish to, using the hauled suv.
I hope not including much in the form of military equipment in my reply does not offend the OP. But I was actually considering the M820. I had the owner of IMP send me pics and everything. It is an awesome setup, and very versatile. However, it is, as mentioned, difficult to install fixtures within the expandable box. Likely the reason the military equipment was not mounted in there, but carried in once the van was expanded and setup.
Hauling is allways better than towing
when possible. Fuel milage is a large consideration, and it appears here on this site, that it is also a consideration to the members here when building something like this. A friend drove a 435 horse cummins, bobtailing with an autoshift, from hillsboro oregon to Illinois(sp) somewhere to buy and pickup a new grain trailer. They got 11mpg bobtailing with all 10 tires on the ground. Pulling the trailer lessened the milage some, but not signifigantly when empty. I have been told by several sources while searching for my truck, that even a 500 hp cat, detroit, volvo, or cummins can get 11 easily when bobtailing a single drive axle. Especially if good driving habits are used and an experienced driver of large trucks and transmissions is behind the wheel. Aint no way I can touch that pulling an equally equipped trailer behind my 2008 dodge 2500 with the 6.7 cummins. While just pullling a small 14' tandem axle flatbed trailer on the highway, I cant get over 12.3mpg. If I had to pull a travel trailer equivelent to the trucks quarters, I'd be sub 10 mpg if there was so much as a breeze head on.
Am I ok making this reply?