First off, I don't have a class 8. But I've "dreamed" about converting one.
Like dollarsok, I like the idea of retaining both rear axels for future re-sale. As I see it, the down sides are greater turn radius, rougher ride, less traction, and less room to hang storage boxes.
I don't think the turning radius would be that much of a problem due to the 50* stear angle. It probably has better turn radius than my dually.
To help with the ride (bob tail and towing) I have "dreamed" of adding a lot of weight using 1" plate to construct a rear bumper and bed. I would also add large coach storage batteries (8Ds or forklift) to the truck that would be connected to a 5th wheel with seperate forklift type connectors.
For additional storage I would add a storage type headacke rack.
Just my $.02.
How far off am I?
Gene
'96' Dodge 3500, 5-speed, 3.54 LSD, Ext. Cab, 205,000 plus miles, K&N RE-0880 air filter, Jannety heat shield, TST #10 plate slid forward 1/8", AFC spring kit, 16 cm exhaust housing, Jardine 4" exhaust w/5" stainless steel tip, South Bend Clutch, SPA digital EGT and boost gauge, relay controlled back-up alarm and rear facing halogen tractor flood lights, air horns, bed liner, Tonnou cover, Geno's manual trans. filter, brite box. Dyno run 1-27-02; 375.6 hp and 798.3 ft. lb. torque at the rear wheels.