We know the drive axle was a problem, its why it was changed to Axle Tech. That resolved items 1 & 2. the transmissions are still made by Dana and do very well. the GM LP gas engines are still used today and do very well. We have customers that run them for 30,000 hours. Cracking tilt cylinders and chassis are normally things we see when the trucks are overloaded, or abused. they're not issues we normally see. I'm happy your company found a solution, its worth pointing out a H7.00XL is a yard truck designed to work outdoors and designed for rough floor conditions. We also make a machine that competes with that model, in-fact we have supplied a variant of that truck to your marina industry.
I'm sure we can find fault in any product, fortunately we have customers that support our company and product.
Have a good weekend,