As a professional Carpenter, who has worked on RV's as well as boat build outs, I can say 100% that you should build square to the floor first and parallel to the walls second. Only change the wall angles if you plan to "skin" or frame out a wall and you can improve on it's right angle to the floor or if it not parallel front to back (But only if you are changing the angle of the whole wall). After that measure everything and forget you own a level (unless you level out the floor by using jacks below the floor to the ground as a temporary measure while you are doing your build out).
If you are looking for stealth, and you are unhappy with whatever angle you are parked on, then install an AIR or HYDRAULIC lift suspension kit. These can be adjust on a one for one basis with a total of 4 installed (think lowrider type setup except softer).
Get a level control panel kit and a bubble level (bullseye) and your set.
As an example below
http://www.autoanything.com/suspension-systems/61A2966A0A0.aspx
<b>Air Lift Air Bag Suspension Kit</b>
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- Air Lift Leveling Kit (LoadLifter 5000 kit shown)
- The heavy-duty LoadLifter 5000 system is ideal when you're hauling hefty loads
- The medium-duty Air Lift Ride Control is perfect for lighter loads
- Features a road-smoothing internal jounce bumper
- The Air Lift 1000 mounts inside your front or rear coil springs
- Lean from an off-center load
- No lean with an Air Lift Leveling System
- Even and stable height with an Air Lift Leveling Kit
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"Very impressed. Would recommend this kit to anyone looking for some airbags to maximize their towing experience." -Joel S. Reno, NV
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"Quality and great airbag kit. Will help a ton when hauling heavier loads and install was very easy." -David S. Queen Creek, AZ
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Features
- Give your vehicle the smooth ride of a Cadillac without sacrificing your ability to tow like a Kenworth with the ingenious Air Lift Air Bag Suspension Kit
- This fully adjustable air bag (aka air spring) system lets you fine-tune the firmness of your suspension: add more air when you're towing or hauling, and let it out when you're commuting
- Your Air Lift Leveling System is custom engineered for your specific year, make and model
- Ride on air (literally) and say goodbye to sag, trailer sway, body roll, bottoming out and rough ride with the ingenious Air Lift Leveling System
- Fill both sides evenly or bolster one side when you have an off-center load
- The Air Lift Level System comes in four styles, depending on your vehicle:
–Air Lift 1000: mounts inside your front or rear coil springs—you get extra rear support when towing or fully loaded, greater handling, and massive back-wheel traction. Up to 1000 lbs of leveling capacity
–Ride Control: connects to your light-duty pickup, medium-duty truck or SUV's leaf springs-delivers the perfect balance of smooth ride quality and sturdy support for towing and hauling. Up to 2000 lbs of leveling capacity
–LoadLifter 5000: these extreme-duty air bags mount to your full-sized truck or SUV's leaf springs-you get massive support for your heaviest loads. Shoulders up to 5000 lbs of leveling capacity
–LoadLifter 5000 Ultimate: The ultimate in air support for your full-sized truck or SUV's leaf springs handles your heaviest loads. The heavy duty bags offer 5000 lbs of leveling capacity and feature a built-in internal jounce bumper to eliminate harsh jarring on rough roads
- For on-the-fly adjustments of your Air Lift Leveling System, upgrade with an optional Air Lift On Board Air Control System
- LoadLifter 5000 Air Lift Leveling Systems boast high-strength, reinforced Zytel endplates and exclusive Shur-grip crimp rings that won't come apart-both carry a limited Lifetime Warranty
- The air bags in your Air Lift Leveling System are built with superior, reinforced natural rubber or tough, molded polyurethane
- The polymer air fittings are easy to connect, leak-free and non-corrosive
- Your Air Lift Leveling System comes with everything you need: air bags, brackets, hardware, air lines, alignment tool (when needed), and detailed installation instructions
- Lifetime Warranty
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Description
The holy grail of suspension technology is the perfect blend of ride comfort and load hauling capacity. In the past, auto builders had to choose one over the other. Today, with the Air Lift Air Bag Suspension Kit, you get the best of both worlds-a smooth ride and plenty of backbone to haul the heaviest loads.
The secret behind the Air Lift Air Bag Suspension Kit is simple: you control the firmness of the air bags. When you're fully loaded or towing a trailer, fill them full of air to do away with sag, sway, bottoming out, roll and more. For everyday commuting, keep them deflated for a downy soft ride. Dragsters can also use the Air Lift Leveling System for greater rear-wheel traction at the speedway. With an Air Lift On Board Air Control System, you can even make on-the-fly adjustments as road conditions change.
The Air Lift Air Bag Suspension Kit is custom-made from rugged materials for your coil over or leaf spring suspension. Most installations don't even require drilling, and all include a Lifetime Warranty.
And now you know ...
T.I.M.