At that price I think I'd save up a bit more and get a fishing chair/bed - a lot more comfortable and warm than an airbed. And won't leak in the middle of the night!
We too are robust and had the old blue & red rubber inflatable mattress for years til it finally retired. After much research bought Aerobeds, very sturdy, has a cordless pump you charge at home, we can get 2 singles in a 3 person tent! Very comfy (we argue about who gets one when visiting in laws) Paid around £80 each but worth it. Also agree with fishing bed idea, we have 2, almost as big as single bed, put fitted sheet on & quilt = spare bed. Warmer as well off the floor.
------------- better a rainy day up a hill than a sunny one in the office
Amazing family weekend with old steam engines, classic car displays, market stalls, and full catering and bar. And camping on site - Save £25 by booking in advance.