Welcome to the IRV2 forum. You've come to the right place.
Hawkins Motor Coach make high quality motorhomes, and I wouldn't be afraid of juming right is to a 40', as you will adjust to it very quickly, and there are tips you will get here on how to handle it like a pro, to keep you out of trouble. But we'll get to that later, as right now you must decide if this particular one is right for you.
It is more than 2 decades old, so plenty of things to check out before you buy. Do they have any legitimate service records, of the routine maintenance? How frequent has the fluids and filters been changed, and what else has been done? Inspect for rotting out bay compartments, storage tank supports, frame damage, engine mounts, etc. CHeck closely inside to any signs of roof leak (water stains on ceiling and walls), any signs of mildew, and odors? Carpet or tile? Poke around the floor, near the walls, and see if the floor feels solid, or is it soft? Check around he toilet for the same.
Do the appliances all work? Water pump, water heater, furnace all work? Check the furnace filter, to see if it is clean, or rotting away. You get the idea.
Remember these things are a house and a big chassis truck, all rolled up into one. So there will always be things to look after, but of the unit is solid, and runs and drives good, it may be a winner.
Unless the date code shows the tires are fairly new, plan on probably 3-4K for 6 new tires right out of the gate.
Good luck, and come back with any questions.
USAF 1965-1971; USCG Master
2002 Horizon 36LD - 2000 GMC Sierra 1500 4x4
Indian River, De