Thanks for the replies. So my engine did have the head gasket work done. Timing belt and valve adjust at 60,000 and runs pretty good but thirstier than I expected. Previous owner implied that it got better than 15 mpg but that's not the case. Don't really want to carry gas inside. So I was hoping there was a bigger after market tank available but then I'm cutting into payload which is already minimal. The 600 lb. load limit includes everything not installed by Winnebago. That means people, water tank, food and any gear you bring along. It has a frame mounted hitch but according to the manual it can't be used to tow anything. Has a bike rack there now. If I put some kind of rack out there it will have to be really light since that weight will be way behind the rear axle. And I didn't realize until after I bought it that it doesn't have a spare tire. There's no mention in the manual but I assume if you get a flat you have to use one of the rear dualies as a spare and drive carefully on one rear to a tire shop. I'm often in remote areas with no cell service where I can't just call for road service. How would you carry a spare? Then again it would cut into the precious payload limit by 50-60 lbs. What do others do? By the way, the recommendation to drive 55 is well taken but if I did that on most highways in California I'm afraid I would enrage other drivers since the slow lane is usually going 70!