Frame Rust problems of the 2012 Dodge Grand Caravan

Have handicapped van, a vmi northstar conversion . Immediately van would shut off while still moving. Battery was dead in am 16hrs after fully charged battery. 3 battery all die-battery disconnect used stop abnormally high drainage . Many bizarre electrical malfunctions, battery drain never found after truely admirable effort. Rust rust rust -sand blast antirust-more rust rust rust to frame-told battery and malfunctions due to a short somewhere. Anyway rust rust some more. Vmi admits rust very unusual so much so quickly. But says no longer responsible due to settlement before for rust rust and malfunctions. Thought replacment vehicle was outcome ,not 11k for electrical malfunctions and rust-told no more abnormal rust anymore but more rust anyway. Googled "constant electrical discharge" and "rust" and galvanic corrusion main results. No local colision place will "fix it" due to liability when brand new steel is no more rust proof than manufactuers. Only vehicle use powerchair says rusted frame may drop me. District manager said rusts should not happen but I signed release after rust treatment-sorry he really was but no more liability for abnormal rust advised not to use vehicle . So this is for others-the vmi conversion nice if functional, maybe rust from vmi conversion process as vehicle entire frame is replaced by vmi. Hopefully just a lemon but its very serious lifethreatening and very real, the rust makes solid steel seaparate like cheese slices. Electrical drain cause and rust cause unknown despite over 100 hrs of work by vmi engineers and local vmi dealer. Would buy a Honda or toyoda and very basic manual conversion. If able get seat comes out and just struggle to get in. The fancy conversion not wortth it between so many unknowns. I couldn't care less about privacy . Its safety for others .