That truck looks like it's in good shape. How many kms on it?
First thing you look up is the load capacity of that truck, and also, what kind of slide-in you are expecting to put in. Many of them really are best off in a 1-ton. If you go for something simpler (without a toilet/shower) then it does make it more manageable.
Consider where you would store it when you don't have it on the truck. Also, watch some videos of loading/unloading it, to get an idea of whether you'll need help with that process (spouse/friends).
With an 8-foot box you definitely have more options for a camper too, so that's good. You'll appreciate the room! Also, there seem to be more used campers available for eight-food beds because not that many people buy long beds nowadays. Watch out for water-damaged junk, of course. These days RVs are going for top dollar. This summer outright junk was selling within days of posting.
About the truck - Personally, if it's been looked after fairly well I would have jumped on it by now. Especially if it's a standard (my weakness!) Could always resell it if you change your mind.
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